BIOL 1902 Lecture Notes - Lecture 11: Visual Acuity, Eating Animals, Depth Perception
19 Mar 2016
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Moose get main supply of sodium in brief period of time in summer usually: go into beaver ponds and eat water plants filled with sodium, sodium stored in rumen. Moose in northern ontario in spring: on side of road ditches, eat mud & drink water, road salt = sodium chloride. Solution for nutrition: some eat plants, some eat animals. Advantages: much more return for effort (proteins already packaged, easier to digest. Disadvantages: can be hard to find, often prey is well protected, they fight back. Animal who eats another animal = predation (big solution to finding nutrition) Some eat animal from inside while it"s still alive (parasitoid) Some eat animals w/o killing the animal (parasite) Before meal is enjoyed, predator must 1st: locate, capture, & immobilize, can break necks, inject poison, etc. Sharp vision e. g. diurnal birds of prey: large eyes collect light, large # of cones for visual acuity, magnifies images e. g. hawks: images magnified by 2-3x.
