#  What Art Thou Little Bird: Developmental Mechanisms for the Origin and Evolution of Birds  

 





 

**HS-LS4-1, MS-LS4-2**

[Fossils, retile phylogenetic tree, feather evolution from scales, homologous wings (8:02 - 13:46)](https://youtu.be/a0VsIG4zcuQ?t=8m2s)

[Field work by the Grants with Galapagos Finches (27:01 - 29:21)](https://youtu.be/a0VsIG4zcuQ?t=27m1s)

[Lab experiments with chicken embryos (30:35 - 35:47)](https://youtu.be/a0VsIG4zcuQ?t=30m35s)