BIOL 1902 Lecture Notes - Lecture 3: American Woodcock, American Bittern, Major Force
26 Feb 2013
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Bodyguards: some animals enlist the help of more powerful animals. Examples: carpenter ants defend aphids and other types of. Paid for their services with food in the form of honeydew. Vigilance = being on the alert for danger. Vigilance, which often involves scanning the environment for signs. Animals scan for: vibrations: can be sensed by some animals. Snakes have no ears; they sense vibrations in the ground. Fish lateral lines on their sides have sensors for vibrations in the. Water: scents: using their noses: olfactory sense (smell) is important. Large snout has a large nasal chamber wth many folds to increase its. Surface area = more olfactory receptors, better detection of odours (moose, deer, etc. ) Vomeronasal organ = jacobson"s organ: special pocket in roof of mouth. The source of the odour: sounds: auditory sense = hearing is imporant to many animals. Mammals (moose, deer, hares) have large external ears = large and. Mobile pinnae to capture sound like parabolic dishes.
