Learn about the intelligence of birds. There are many examples to illustrate communication, use of tools, and general resourcefulness that many birds show.

These pages are part of a site called "Evolution," that accompany a textbook by the same name. Mark Ridley is the author. This section is about Darwin, his travels, and his observations that led to "On The Origins Of Species."

This encyclopedia article from Wikipedia on adaptive radiation discusses what it is, lists some examples, and distinguishes between the three different types of adaptive radiation.