BIOL 1902 Lecture Notes - Lecture 3: Skink, Altricial, Parental Investment
8 Sep 2015
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Northern water and garter snakes hold eggs internally until they hatch=ovoviviparity the eggs are not nourished internally the young that are born are not guarded. Other females guard their eggs: five-lined skink female red-backed salamanders guard eggs. Do any male animals guard the eggs and young: male bass do, giant water bugs do. Moose: eight month gestation with placental connection, young are precocial, parental care involves protecting the young, and feeding them, cow moose protect their young for one year, total parental investment=20 months. In 95% of mammals, females provide all of the parental care: but there are exceptions. Wolves are social animals: the pack cooperatively raises the pups, food is brought to the pups at rendezvous sites. In mid-summer pups are taken to open places called rendevous sites. Not all female mammals invest a lot internally. Black bear cubs are born highly altricial (hardly developed: born in january (dormancy, females stay with the cubs for 1. 5 years, protect them.
