Male Ruby-throated Hummingbird
 
Ruby-throated Hummingbird  



 This bird
•aggressively defends its food supply and its surroundings against intruders
•makes an amazing annual migration flight that includes crossing the 800-km expanse of the Gulf of Mexico 
•skilfully uses a variety of materials to build a nest that looks like a natural knob on the branch of a tree or shrub
•beats its wings about 55 to 75 times a second
 