The Mexican tetra is a river fish that can regenerate its heart tissue. Meanwhile, zebrafish not only can regrow the retinal tissue in their eyes, but can also regenerate damaged parts of the ...

Also, while they're sometimes called "Mexican walking fish," they're amphibians, not fish at all. In the wild they are most ...

Latin America is a land of jaw-dropping biodiversity. Stretching from Mexico down to the southern tip of South America, this ...