Volume 13 , Issue 33

Hummingbird Physiology

As we research our Ruby-throated hummingbirds (Archilochus colubris), we find that many migrant birds, go through hyperphagia prior to migration. they eat continuously, while consuming tiny insects that are full of fats and proteins. They use up the sugar almost instantly during everyday activities, including hyperpahaic frenzies. The protein is applied toward strengthening their flight muscles.

The hummingbirds store surprising amounts of energy-rich yellow fat that will burn off efficiently during migration. This fat is laid down primarily in the wishbone region, but also forms at other locations of the body, including along the flanks where the legs attach to the body. The fat deposits tend to stretch the skin and probably cause the feathers to stand up a bit, making the hummingbird to look even fatter than it already is. The male Ruby throated hummingbird may put on 2 to 2.5g of fat during the hyperphagia frenzy, doubling its mass before migrating across the Gulf of Mexico to the Yucatani. READ More   |  View or Add Comments (0 Comments)   |   Receive updates ( subscribers)  |   Unsubscribe

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