Home Biology 31 Animal Species that Take Survival to the Next Level
Biology By Trista -

Young animals are always cute to look at no matter the species. You wouldn’t think that they would have a lot of hate in their heart or the thought of murder in their minds, but Mother Nature can be cruel sometimes.

Even at such a young age, some types of animals have to take every chance they can get to ensure that they’re the one who comes out on top. Most of the time, that means taking out the competition — survival of the fittest! Here are a few animal offspring that will take the lives of other animals to ensure their own survival.

31 Animal Species that Take Survival to the Next Level
Golden Eaglets. Photo Credit: Pixabay

1. Golden Eaglets Have Sibling Rivalry

A golden eagle’s nest is pretty big, but it’s not big enough for the two to three eaglets that dwell within. Eggs are usually laid a few days apart, so whichever eaglet hatches first is already going to have a head-start in the nest.

31 Animal Species that Take Survival to the Next Level
Golden eagle baby. Photo Credit: Emblan/Shutterstock

They will peck at and bully their younger siblings and often hog the food for themselves, leading to the younger eaglets not thriving as well. The parents don’t do anything to interfere; it’s just how the strong survive.

31 Animal Species that Take Survival to the Next Level
Hyena Portrait. Photo Credit: Ondrej Prosicky/Shutterstock

2. Sibling Murder Is Common With Hyenas

Other than animals, hyenas pretty much dominate the plains. The cubs are already born with strong, sharp teeth and with their eyes already open so that they can fend for themselves.

31 Animal Species that Take Survival to the Next Level
Hyena Pack. Photo Credit: Ondrej Prosicky/Shutterstock

That’s what makes them so dangerous to each other. Cubs will fight each other for dominance within the burrows to establish a pecking order, but often, the weaker cubs are so traumatized that they refuse to eat when good is brought back by their parents.

31 Animal Species that Take Survival to the Next Level
A female paper wasp. Photo Credit: Pavel Krasensky/Shutterstock

3. Female Wasps Commit Fratricide

A species of parasitoid wasp creates offspring by laying two eggs into caterpillars, one male and one female. These eggs clone each other with the result being more female and male larvae.

31 Animal Species that Take Survival to the Next Level
The common wasp Vespula vulgaris. Photo Credit: Thomas Hochreutener/Shutterstock

Out of these, about 50 females will hatch that have smaller jaws and so reproductive organs. They work by eating the males, leaving enough alive to fertilize those females who can reproduce. This is so that there is enough food to go around for everyone. Cruel, but it works.

31 Animal Species that Take Survival to the Next Level
Sand Tiger shark. Photo Credit: Wikipedia

4. Sand Tiger Sharks Perform Murder In Utero

Sand Tiger sharks are pretty much harmless to humans, and what’s unique about them is that they’re one of the few sharks which give birth to live young instead of laying eggs. What’s even more interesting is that the females have two wombs.

31 Animal Species that Take Survival to the Next Level
Sand Tiger Shark. Photo Credit: Pixabay

It doesn’t take long for them to develop teeth while they’re still inside the womb and will resort to eating each other as well as any unfertilized eggs. This leaves two survivors in the end, one in each womb, that enter the world already killers.

31 Animal Species that Take Survival to the Next Level
Female black widow spider weaving web. Photo Credit: Mark_Kostich/Shutterstock

5. Female Spiders Eat Everyone

You would think that the baby spiders would be the ones doing the eating, but it’s actually the mother that’s doing the chowing down. She’ll eat the father of her offspring or the offspring themselves if she’s hungry enough.

31 Animal Species that Take Survival to the Next Level
Female of Mediterranean black widow. Photo Credit: Dmitry Fch/Shutterstock

It’s no secret that black widows will eat the males right after mating, but they’re not the only spider that does this. But if the mother has been fasting while she’s guarding the eggs, she may get hungry enough to start chowing down on a few eggs to keep herself alive.

31 Animal Species that Take Survival to the Next Level
Beautiful Snowy Egrets. Photo Credit: Pixabay

6. Snowy Egrets Not Putting All Their Eggs in One Basket

It’s typical of snowy egrets to lay three eggs, and they do this for a particular reason. The first two eggs get high doses of hormones, increasing their ability to thrive. The third egg only gets half.

31 Animal Species that Take Survival to the Next Level
Snowy Egret in breeding plumage wading. Photo Credit: Brian Lasenby/Shutterstock

This leads to the birth of a weaker sibling, which the other two bully to death or push out of the nest. This third chick is a “just in case” baby: it only serves the purpose of being a replacement if something happens to the other two.

31 Animal Species that Take Survival to the Next Level
Barred Tiger Salamander. Photo Credit: Matt Jeppson/Shutterstock

7. Tiger Salamanders: Meals Involve Family

Tiger salamanders are similar to frogs in that they start off as tadpoles in the first stage of their lives. However, they can develop into two different kinds: standard and “cannibal.” The latter type has a more massive mouth and longer teeth and starts to form when ponds dry up, and food becomes scarce.

31 Animal Species that Take Survival to the Next Level
Tiger salamander. Photo Credit: reptiles4all/Shutterstock

This makes it easier for them to eat the smaller tadpoles so that they can develop more quickly and morph into their adult forms before the pond completely dries up. They’ll eat brothers, sisters, and cousins; no one is immune from being on the menu. But they are courteous enough to eat non-family tadpoles first.

31 Animal Species that Take Survival to the Next Level
Cuckoo Bird. Photo Credit: Wikimedia Commons

8. Murdered by Cuckoo Birds

You’ve heard of sibling rivalry, but no one rivals the cuckoo when it comes to vying for all of the parent’s attention. And they’re not even their birth parents. Female cuckoos look for unprotected nests and will eat one of the eggs inside, giving the nest room to lay one of her own.

31 Animal Species that Take Survival to the Next Level
Yellow-billed Cuckoo. Photo Credit: Paul Sparks/Shutterstock

Then she flies off and leaves the real owners of the nest to take care of her baby for her. A baby cuckoo is usually the first to be born and will push out the other eggs so that it can get all of the attention.

31 Animal Species that Take Survival to the Next Level
Queen honey bee laying eggs. Photo Credit: Pixabay

9. Beheading for the Monarchy: How Queen Bees Thrive

Typically, a bee colony will consist of one queen, worker bees, and a few drones that serve the purpose of fertilizing the males. The worker bees – which are sterile females – produce Royal Jelly, which is used to feed the larvae.

31 Animal Species that Take Survival to the Next Level
Queen bee closeup. Photo Credit: Lipatova Maryna/Shutterstock

However, as the queen bee gets older, they will pick out a few unique larvae, separate them from the rest, and give them more substantial doses of Royal Jelly to transform them into future queen bees. But queens don’t share the throne. Once the first one emerges, it goes on a killing spree and stings the others haven’t appeared yet or any others that have emerged until there is a clear winner.

31 Animal Species that Take Survival to the Next Level
Praying Mantids. Photo Credit: Pixabay

10. Praying Mantises Practice Cannibalism

We’ve all heard the story about female praying mantises biting the heads off their mates while they’re engaged in sex, but this isn’t where the buck stops. After she lays her 200 eggs and they hatch, then the real carnage begins.

31 Animal Species that Take Survival to the Next Level
Praying Mantis Insect Leaf. Photo Credit: Pixabay

They usually all hatch at the same time and it turns into a buffet frenzy. Their first meals often involve each other when there are no other insects around to eat.

31 Animal Species that Take Survival to the Next Level
Arachnid Spider. Photo Credit: Pixabay

11. Crab Spider Babies Get In on the Action Too

It’s a familiar tale that female spiders eat their mates, but newly hatched babies aren’t immune either. For crab spiders, dinner time involves everyone.

31 Animal Species that Take Survival to the Next Level
Close up crab spider. Photo Credit: Jordan Roper/Shutterstock

The mother will provide “nurse” eggs to their babies, which are unfertilized eggs. They’ll start to eat these and then slowly work their way through their own mother until she is completely gone. The ones that do ingest their mother actually have higher survival rates than the ones that don’t, so though it sounds gross, it’s actually quite beneficial.

31 Animal Species that Take Survival to the Next Level
Portrait of huge walleye in angler hand. Photo Credit: Piotr Wawrzyniuk/Shutterstock

12. Walleye Fish Go Bottoms Up

You wouldn’t think fish would really engage in this kind of practice, but it’s actually not that common. Also known as yellow pike, these fish will eat each other tail-first.

31 Animal Species that Take Survival to the Next Level
Walleye in the angler’s hands. Photo Credit: ElvK/Shutterstock

What’s a little funny about this is that one fish will start eating another, and in turn be eaten themselves. It’s like one chain of cannibalism that doesn’t know where to stop. The biggest fish will usually triumph, however.

31 Animal Species that Take Survival to the Next Level
Polar bear pair. Photo Credit: Wikimedia Commons

13. Polar Bears Aren’t Just for Smiling on Coke Cans

This has only been a recent development, but it has been reported that polar bears have been eating the smaller and younger members of their population.

31 Animal Species that Take Survival to the Next Level
Polar bear close-up. Photo Credit: Edwin Butter/Shutterstock

This is likely due to the melting of ice blocks making it more difficult for them to traverse, leading to higher starvation rates. And when they can’t get to their food supplies, they have no problems resorting to eating their own kind to survive.

31 Animal Species that Take Survival to the Next Level
Giant scorpion on sand. Photo Credit: Pixabay

14. Scorpions Will Eat Their Babies

A mother scorpion is capable of having about 100 or so babies, which is a lot of mouths to feed. And when you’re out in the desert, that can be even more difficult.

31 Animal Species that Take Survival to the Next Level
Scorpions in situ in Southern Africa. Photo Credit: Matthew Sakko/Shutterstock

But if push comes to shove and she can’t find enough grubs, the mother will have no problems eating a few of her own babies to survive. After all, she can just lay 100 more to replace the ones she’s eaten for breakfast.

31 Animal Species that Take Survival to the Next Level
Mother Hen Mom Chicken. Photo Credit: Pixabay

15. A Clucking Good Time

Would you be surprised to learn that chickens, of all animals, have no problems with eating their young? We’re not talking about hatched baby chickens, however.

31 Animal Species that Take Survival to the Next Level
A group of chicken. Photo Credit: Moonborne/Shutterstock

Hens who suffer from a calcium deficiency in their diet will ingest their own eggs to fulfill those needs. The shell itself is rich in calcium, so to keep themselves healthy, they will swallow them whole, whether they’re fertilized or not.

31 Animal Species that Take Survival to the Next Level
African field cricket, Gryllus bimaculatus. Photo Credit: Wikipedia

16. Chirping Songs in Mourning

Crickets are known for their beautiful summer songs when they’re trying to catch a mate. It’s a wonderful thing to listen to when the sun is going down.

31 Animal Species that Take Survival to the Next Level
The wild insect the cricket. Photo Credit: Ashabari Ray/Shutterstock

But crickets that don’t survive the season are an excellent food source for their own kind. Crickets have been seen feasting on the dead bodies of other crickets, whether they’ve died from natural causes or have been run over by cars.

31 Animal Species that Take Survival to the Next Level
Perch River fish. Photo Credit: Pixabay

17. Perch Eat Babies as Snacks

The perch is another type of fish that has no problem eating its own kind. It’s actually quite aggressive, but they are also cannibals at heart.

31 Animal Species that Take Survival to the Next Level
The European perch. Photo Credit: zdenek_macat/Shutterstock

Both the adults and the young are known sometimes to eat the youngest and smallest members swimming around in ponds and streams. It’s not a territory or dominance thing; they eat because they want to.

31 Animal Species that Take Survival to the Next Level
Soybean cyst nematode and its egg. Photo Credit: Wikipedia

18. Baby Nematodes Are Chestbursters

Nematodes are naturally hermaphroditic, meaning that they have both sexual reproductive organs for self-fertilization. They’re also used as a food source for other animals, so in order to keep their numbers up, they self-fertilize hundreds of eggs at a time.

31 Animal Species that Take Survival to the Next Level
Nematode worm. Photo Credit: Peddalanka Ramesh Babu/Shutterstock

But instead of laying those eggs, they develop and hatch inside. These babies will eventually eat their way out, consuming the nutrients from their parents in order to survive.

31 Animal Species that Take Survival to the Next Level
Bottlenose dolphin. Photo Credit: Pixabay

19. Flipper is No Friend

People have come to believe that dolphins and porpoises are gentle creatures that don’t mean anyone any harm. But they would be sorely mistaken.

31 Animal Species that Take Survival to the Next Level
Bottlenose dolphin. Photo Credit: Tory Kallman/Shutterstock

Male bottlenose dolphins have great memories and know which females they’ve mated with. When they meet a female they don’t know with a young calf, they will have no problems with separating them and killing the young so that the female can become fertile again.

31 Animal Species that Take Survival to the Next Level
Red Ornamental Shrimp. Photo Credit: Pixabay

20. Nothing Shrimpy About These Guys

Shrimp aren’t against eating a few of their own young on occasion, but this drive can be kicked into overdrive with a specific parasite. It’s no bigger than a human blood cell, but it can cause a lot of havoc.

31 Animal Species that Take Survival to the Next Level
Crystal Red shrimp. Photo Credit: Toxotes Hun-Gabor Horvath/Shutterstock

This parasite demands more and more food, and the shrimp have to comply. This results in them eating hundreds and hundreds of their young, never feeling full. This can decimate shrimp populations, but thankfully the unaffected shrimp can make up for the loss of these numbers.

31 Animal Species that Take Survival to the Next Level
Two rabbits eating grass at daytime. Photo Credit: Pexels

21. Bunny Rabbits Aren’t Always Herbivores

Rabbits like to keep themselves very clean, as well as their dens and nesting areas. This can be seen as both a good and a bad thing.

31 Animal Species that Take Survival to the Next Level
A wild orange Rabbit/bunny with big ears in a fresh green forest. Photo Credit: FullframeFactory/Shutterstock

If a mother rabbit senses that a predator is near, she will ingest her stillborn or weak babies in order to keep the nest tidy and prevent predators from finding them. Being stressed out can also lead to babies being eaten, so if you plan on keeping them as pets, ensure that a pregnant mother is always kept in a good mood to prevent this from happening.

31 Animal Species that Take Survival to the Next Level
A cute little hamster. Photo Credit: Pixabay

22. Tiny Fluffballs Can Be Killers

Hamsters are one of the first pets that small children have, as they’re easy to keep and aren’t a lot of hassle. But your children may not be prepared for the reality of a hamster’s diet.

31 Animal Species that Take Survival to the Next Level
Pearl Winter White Russian Dwarf Hamster. Photo Credit: Wikipedia

Mother hamsters are prone to killing and eating other hamsters, as well as their own young. They likely do this when they feel their territory is being threatened. So it may not be a good idea to have several hamsters in a cage at the same time if you’re not prepared for this possibility.

31 Animal Species that Take Survival to the Next Level
Black guillemots bird. Photo Credit: Pixabay

23. Black Guillemots are Baby Murderers

If you’ve never heard of black guillemot before, that’s okay. They’re a pretty small seabird that lives in the northern regions of the planet. They’re pretty docile already, but infanticide is pretty big for them.

31 Animal Species that Take Survival to the Next Level
Black guillemot resting on a cliff. Photo Credit: Wikipedia

Studies by local universities have shown that adults will peck babies to death or throw them off cliffs. However, it’s not the parents doing the murder, but other adult birds who find chicks that are left unattended.

31 Animal Species that Take Survival to the Next Level
Prairie Dogs. Photo Credit: Pixabay

24. Prairie Dogs Commit Serial Infanticide

One of the most giant rodents on the plains of Texas all the way to Canada, they’re a pretty common species to run into. They serve as prey for many other animals, such as badgers and coyotes, and even their own kind.

31 Animal Species that Take Survival to the Next Level
Adult prairie dog and a baby sharing their food. Photo Credit: Nick Fox/Shutterstock

Both mothers and fathers are guilty of the practice. Females will kill off entire litters of other mothers when they can, and it’s believed that they eat the young to obtain nutritional value. Fathers, on the other hand, know which females they’ve mated with and will kill pups of the litter that they believe have different parentage than their own.

31 Animal Species that Take Survival to the Next Level
A meerkat sitting alone. Photo Credit: Pixabay

25. Meerkats of the Prairie Get Into Vicious Fights

The meerkat is known for living in large family packs that move and thrive together to survive. They’re actually very social animals that thrive on attention. So it’s a little confusing that they would actually resort to killing their own.

31 Animal Species that Take Survival to the Next Level
Group of Meerkat. Photo Credit: Mrinal Pal/Shutterstock

The alpha female of any pack will kill the offspring of lesser females when she gets the chance. Then, these females are forced to either become wet nurses for the alpha’s family or to leave the pack in exile. Not the most comfortable choice in the world to make, as being on your own means a higher risk of becoming someone else’s meal.

31 Animal Species that Take Survival to the Next Level
A mother chacma baboons with her child. Photo Credit: Pixabay

26. Chacma Baboons Commit Infanticide to Regulate Numbers

Apes have pretty stable social structures. Everyone knows their place, and it’s rarely challenged as it can lead to vicious fights that often result in lost numbers.

31 Animal Species that Take Survival to the Next Level
An olive baboon in Africa’s Lake Manyara National Park. Photo Credit: Paul Tessier/Shutterstock

However, chacma baboons, despite their strong familial ties, will resort to killing babies. The alpha males will murder the offspring of a female that they haven’t sired. This act leads to the female no longer lactating and becoming fertile again so that she can be viable to produce babies for them.

31 Animal Species that Take Survival to the Next Level
Three hanuman langurs. Photo Credit: Pixabay

27. The Murderous Practices of Hanuman Langurs

The Hanuman langur is respected amongst Buddhists, as they’re considered to be the embodiment of their deity Hanuman. They’re used as a form of pest control in keeping unwanted monkeys away. But that’s where their cute antics stop.

31 Animal Species that Take Survival to the Next Level
Gray Hanuman langur. Photo Credit: Wikimedia Commons

In a troop of langurs, there is one dominant male that is defended by the other females. If a new male manages to oust him, this new leader will kill all the infants in the troop so that he can better establish his DNA within the group.

31 Animal Species that Take Survival to the Next Level
Common Chimpanzee sitting next in the Zoo. Photo Credit: apple2499/Shutterstock

28. Chimps Exchanging Lives for Bananas

Chimpanzees are another ape species that can get pretty violent when it comes to ensuring that their genes come out on top. The males battle to be the dominant sex partner in the group, and gangs of males will battle each other for dominance.

31 Animal Species that Take Survival to the Next Level
Two playful baby Chimpanzees sitting side by side. Photo Credit: Andy333/Shutterstock

These fights can get pretty brutal, and unprotected children often fall into their warpath. What’s even sadder is that at the end of it all, the mothers will side with the victors, also if they’re the ones responsible for the death of their children.

31 Animal Species that Take Survival to the Next Level
Lion standing behind lioness. Photo Credit: Pixabay

29. The Pride of the African Continent is Quite Ruthless

Dubbed the “kings of the jungle,” lions actually live on the plains of African countries. But even with this moniker, lions have been losing their prey and habitat with the encroachment of humans into their territory.

31 Animal Species that Take Survival to the Next Level
Lion mother of Notches Rongai Pride with cub. Photo Credit: Maggy Meyer/Shutterstock

They’re also their own worst enemy. When a new male ventures into a pride, he will kill off any of the cubs that are alive after he ousts the alpha male. This makes the females fertile again so that they can mate and create new offspring of their own.

31 Animal Species that Take Survival to the Next Level
Grizzly bear. Photo Credit: Pixabay

30. Grizzlies aren’t the Only Mean Ones

Bears are one of the dominant omnivores of the forest, capable of eating anything and everything they come across. With those big powerful teeth, they can defend themselves quite well against any other predator.

31 Animal Species that Take Survival to the Next Level
Protective female brown bear, ursus arctos, standing close to her two cubs. Photo Credit: WildMedia/Shutterstock

But those teeth are also perfect for eating their own young. Although a mother bear is fiercely protective, if she senses that her cubs are sick, she will eat them to put them out of their misery instead of trying to raise them to be healthy.

31 Animal Species that Take Survival to the Next Level
A sea otter floats on it’s back. Photo Credit: Pixabay

31. Cute and Cuddly Sea Otters Have Blood on Their Hands

Sea otters are some of the most treasured animals at the zoo. They look cute and cuddly like they don’t have a mean bone in their body. However, you would be dead wrong.

31 Animal Species that Take Survival to the Next Level
Sea otter hugging her pup close to her as she floats on her back. Photo Credit: Manuel Balesteri/Shutterstock

Although they’re not interested in killing their own kind, they have been seen drowning and killing juvenile seals. To make matters worse, researchers have witnessed sea otters keeping the dead bodies and mating with them. This is normal behavior when mating with the females, and researchers have argued that its sexual frustration to the declining female sea otter population.

 

Where Did We Find This Stuff? Here Are Our Sources:

“10 Killer Animals That Commit Infanticide.” Nicollette B, ListVerse. March 28, 2016.

“Baby Animals That Kill Each Other To Reign Supreme In The Crib.” Hannah Irvine, Ranker.

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