Bird Adaptation for Flight Websites

http://www.iaszoology.com/flight-adaptations/

http://www.projectbeak.org/adaptations/skeletal_fewer.htm

http://feathernotes.weebly.com/1/post/2011/06/bird-adaptations-for-flight.html

http://sciencelearn.org.nz/Contexts/Flight/Science-Ideas-and-Concepts/How-birds-fly