Running through the rainforest in the northern portion of South America is the Amazon river ... but scientists assume that it may be from plant poisons carried by their prey.

The plant gives it a greenish tint that is useful camouflage in the trees of its Central and South American rain forest home. Sloths are identified by the number of long, prominent claws that they ...

There are many indigenous communities living in the rainforest today. The Amazon River is the longest in South America ... are designed to tear through plants and animals. Piranhas lose their ...

Forests flanking Brazil's rivers act as "highways" that have allowed tree species to move between the Amazon and Atlantic ...