BIOL 1902 Lecture Notes - Lecture 9: Spruce Grouse, Grater, American Goldfinch
15 Aug 2018
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Challenges eating plants: biting plants off and digesting due to tough structural components. Slugs & snails: break off plant tissue with radula = chainsaw teeth. Caterpillars: mandibles = garden sheers teeth: leaf blotch miners: some eat while inside the leaf (holey leafs, serpentine miner: snake like patterns. They never stop growing: enamel outside and dentine is soft inside, orange because enamel has iron in it to give it strength. Moose: only have lower incisors to rip off plants (rip off) front teeth: cheek teeth grind up food = molars and premolars, masseters muscle drives mouth to grind. Analogous structures: things that all complete same function but different (mandibles, radula & cheek teeth, gizzard) Spruce grouse: eat spruce needles, bills snip them off: gizzards - cheese grater like to grind food (turkey, they swallow little stones and stuff like a pool stand filter, digestion.
