BIOL 1902 Lecture Notes - Lecture 24: Muskrat, Tree Swallow, Siblicide
17 Jun 2015
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Component 5: future returns and the economics of life cont"d: not all female animals invest a lot internally cont"d, opossum pouch is analogous to a womb, ex. Bats mate in summer and give birth the next spring. Their gestation is ~40 days, but they do not exhibit delayed implementation. The sperm is stored in storage to keep it from contacting the egg. Social insects (bumble bees and paper wasps) also store sperm: ex. Paper wasps, ants, and other insects display group care for the young: ex. Social insects such as ants have castes (different groups, i. e. caregivers, queen, slaves) with some individuals working as caregivers for the eggs and young: >90% of all bird species provide biparental care, eggs are a huge investment. Shells require a lot of calcium and yolk. Ducks, grouse, and sandpipers have large eggs, 40% yolk. After songbirds hatch, the altricial nestlings stay in the nest. Whereas bigger eggs hatch more developed birds and the.
