While on land, the killifish has evolved to be able to breathe through its tail as blood passes just close enough to the ...

High in the Andes of northern Ecuador, cities sit in the shadow of mountains and ancient volcanoes covered in dense forest.

These ancient fish, little changed over many millions of years, can reach 16.5 feet long, including the tail. There are reports of giant stingrays weighing up to 1,300 pounds, though such accounts ...