BIOL 1902 Lecture Notes - Lecture 12: Peregrine Falcon, Spider Wasp, Rachel Carson
15 Aug 2018
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Skinning: hawks: pull off feather and fur and leave bones, bears: skin animals, fishers: skins porcupines. Runs around and slashes and bites face, flips over to kills because no quills: wolves: social hunters in packs. Wolves eat part of hair to protect from small bones from hurting them. Owls: swallow whole, gizzard grinds fur and bones and coughs pellets back out (find skeletons) Drawbacks: prey fights back, lethal hooves, accidents during chase, toxins (botulism) Great black gull: eats fish that have toxins from pollution. Then passes up food chain and called bioaccumulation: famous case peregrine falcon near extinct by ddt (plants>insects>songbirds>falcons, rachel carson famous book (got rid of ddt) (thinner eggshells that crack, clumsy) Human persecution: kill animals are deemed nasty (coyote) (affects other targets too) Predators are a major force in natural selection and evolution. Mosts are young stages only. (lays eggs on living caterpillar) Braconid wasps: only larvae (behaviour change in caterpillar: it stops moving high in branch)
