Travel to Ecuador to see how the process of natural selection operates in populations of rainforest hummingbirds (Description from the website). In addition to explaining the basic concept of natural selection, this video also explains genetic variation, and addresses the MISCONCEPTION that individuals can change their traits through environmental interactions. The 7 videos in this series of evolution can be found here: http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html