Naked Mole Rat
These naked mole rat babies have an extreme way of living. If one baby wants to become the queen and move up the line, she has to go up to the current queen and kill her. Sounds pretty harsh to reach this shift in leadership. They’re a pretty unique mammal, and according to author Miguel Brieño-Enríquez, “They’re the longest-lived rodent, they rarely get cancer, they don’t feel pain like other mammals, they live in underground colonies, and only the queen can have babies. But to me, the most amazing thing is that they never stop having babies.” Once the naked mole rat becomes queen, she starts having 10-15 babies at a time. And every time she gets pregnant, her disc space opens up, which means she can eventually give birth to a litter of 33 babies (Live Science).