POUL 1010 Lecture Notes - Lecture 4: Trachea, Specific Appetite, Hearing Range
26 Mar 2018
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Document Summary
The genetic mechanisms that result in the alternating bar nonbar feather pattern, the development of (cid:862)eyes(cid:863) in the tail feathers of a peacock and many other bizarre color patterns seen in feathers of a wide variety of species. Avian eyes constitute a much greater volume of the bird s head than in mammals. Avian eyes are not as spherical as mammalian eyes. The function of taste is to encourage the ingestion of nutrients, to discriminate among foods that are available and possibly to avoid those that are toxic: vision. Eyes moistened by secretions from harderian and lachrymal glands. Because they are preys, they keep one eye open. Detect movement around them or predators coming: hearing. There is a huge variation in olfactory system among different bird species: taste. Vocalization: birds do not have vocal chords; vocalizations are created by the syrinx (located where the trachea bifurcates into the primary bronchi which go to the lungs).
