BIOL 2101 Lecture Notes - Lecture 7: Limnology, Lake Huron, Detroit River
16 Nov 2016
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Females are the size of a marble bigger than males. Close relative of the black widow (north american version of this one) Males are the size of a grain of rice -- still has hourglass pattern, but his is beige and not red. All have venom that allows them to subdue prey that they can then digest. Female is in process of eating him, sexually cannibalistic: male flips upside down into her jaws, and she begins to eat him alive. Red dot on mom bird so the babies can peck at that target to get food behaviour that evolved to serve the best interest of the animal. Hormonal mechanistic way to mate (lion example; adult males recognize unrelated cubs by unfamiliar odour, triggering aggression) Evolution; ultimate (phylogenetic history) a whole bunch of animals in an evolutionary thread connected by cannibalism, where the male allows himself to be eaten (lion example; three other panther species tigers, jaguars, leopards, are more solitary)
