PBS
Pbs Learning Media: Hummingbird Species in the Transitional Zones
This video segment from Evolution: "Darwin's Dangerous Idea" shows biologists Chris Schneider and Tom Smith studying hummingbirds and other animals in Ecuador. Their research is investigating the processes by which new species are formed.
PBS
Pbs: The Life of Birds
Online companion to the PBS program "The Life of Birds." In-depth look at certain behaviors of birds, the evolution of birds, birds as parents, and bird songs.