Why do Toucan's live in the rainforest?

Answer 1

The toucan is adapted to a rainforest environment, in the same way that an orangutan is adapted to rainforest living. Your question might need to be expanded: for example, do you want details of the toucan's diet, living and breeding habits? Or do you want to know how toucans evolved into rainforest species? You might like to refer to http://en.wikipedia.org/wiki/Toucan and its references to see whether your basic question is answered there.

Answer 2

The toucan lives in the canopy layer