Sacoglossan Sea Slugs
Limb regeneration might not be something humans can do at this point, but there are many animal species that can. It is so common that most of the animals that can do it are not considered “mysterious animals” at all. Lizards, worms, and even animals as large as alligators have done this in the past. However, losing a tail or even foot only to grow it back isn’t really that impressive anymore. Now, you have to do a lot more to be considered special. One particular sea slug species understood that assignment and went for the A++ score. Two species of the Sacoglossan Sea Slug shocked the world when they dropped their heads, literally.
This discovery was made by researchers at the Nara Women’s University in Japan in March 2021. The team discovered the slugs are also able to drop their heads and regenerate an entirely new body from that discarded head. This even comes complete with all-new vital organs such as a new heart. Most of the time, when something is dropped by a species, that limb just dies off. Yet this is the first case of that body part regenerating an entirely new body around the discarded body part! Deadpool is going to be upset when we tell him.