BIOL 1902 Lecture Notes - Lecture 18: Ruffed Grouse, Vocal Sac, Amplexus
13 Jul 2017
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Asexual: drawback= limited diversity (basically no diversity) when you just divide your own cells. So no evolution in the species and when something bad happens probably all will die. Inside body: external, release eggs/sperm, penis bone= baculum (seals have it and so do walrus) How do they meet: by chance, barnacles who are sedentary and are hermaphrodites. Barnacles have a huge penis, 40 times the length of a barnacle: advertising, auditory advertising, birds do that, sound does not have to be via vocalization. Wood peckers beat their beak very rapidly on wood to attract a mate: they drum it. Each type has its own special drumming sequence (non- vocalization advertising) Ruffed grouse also drum: they males go on top of logs and flap their wings on the wood. The sound comes from their chest as they beat their wings. Snipes use their tails to produce non-vocal sounds. Crickets and grasshoppers make sounds by rubbing their wings/legs together.
