Why is there so much biodiversity in the tropics? - Livescience.com

We've known this for centuries, but the explanation is not simple.

A poison frog (Dendrobates tinctorius) sits on a leaf in the tropical rainforest.  (Image credit: Dirk Ercken via Alamy Stock Photo) It's one of the oldest questions tackled by naturalists: Why do t… [+6363 chars]

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