Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
    
Click to return to the Evolution Home Page
darwin change extinction survival sex humans religion
Online Course for Teachers: Teaching Evolution

About this Course 

SESSION 4

SESSION 4: What Are the Processes for Evolution?

Elaborate Part A: Speciation without Geographic Isolation

Close up of  a hummingbird's head and beak.

Biologist Chris Schneider believes that populations may evolve into new species without geographic isolation. To learn more about this kind of speciation, called sympatric speciation, join Schneider and his team in Ecuador in the Evolution Show One video segment, "Hummingbird Species in the Transitional Zones" and read the related background information.

Hummingbird Species
in the Transitional Zones

View in:
QuickTime | RealPlayer

 

Next: Elaborate Part B: The Galapagos Finch Study

Videos Web Activities Site Guide About the Project FAQ Glossary Site Map Feedback Help Shop