BIOL 1902 Lecture Notes - Lecture 5: Spruce Grouse, Green Darner, Red Knot
Document Summary
Sub zero temperatures: 2nd problem for winter-active animals: Mobility: (the ability to move freely and easily): because of high snow, snow builds up and gets to deep to walk through. Eg: moose have very long legs- 2 m high! at the height of your shoulder: big feet . Snow shoe hares have bigger hind feet, but their tracks look like their front feet are bigger because when they jump they bring their hind(back) feet to the front. Northern grouse have feet that have feathers on their feet: ruffed grouse grow snowshoes every autumn. Migration: many other animals escape sub-zero temperatures for migrating, animals that migrate: Most our birds migrate and travel very long distances. Artic tern: ex-world champion migratory bird: 20,000 km roundtrip each year! Birds store fat (not carbohydrates): fat powers flight, the more weight you have, the more energy you need to fly. Semipalmated sandpipers double their body weight in just 10 days of feeding.
