Don't just tell your class about Darwin's finches ... show them! Sort some of science's most famous birds using an interactive lesson. Learners try their hand at classifying finches using song, sonogram, and beak appearance, as well as...

[Free Registration/Login may be required to access all resource tools.] Do you ever wonder why some birds are big like ostriches and some birds are small like robins? Or why a lion has a mane while a leopard has spots? In the 19th...