BIOL 1902 Lecture Notes - Lecture 24: Meadow Vole, Umbilical Cord, Tree Swallow
22 Apr 2016
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Ducks give broken wing act (feigned (broken) injury: e. g. Killdeer pathetic broken wing act plus simulated wound . Ducks & goose broods can be extremely large due to: brood amalgamation (cr ching: e. g. Young can be lead to safety, but not all these young might not be hers: egg dumping intraspecific (w/in species) vs. interspecific, facultative brood parasitism e. g. black-billed & yellow-billed cuckoo. Opossum can have as many as 20 (even 50) babies: have only 13 nipples first 13 babies to rush to a nipple, the rest all die. Nipple swells inside baby"s mouth & becomes stuck on it, nipple grows longer (behaves like an umbilical cord: 50 babies: survival of the fittest, compete from altricial stage. Occurs in eagles oldest eaglet kills the youngest (siblicide: second egg of eagle is more like an insurance policy (if first baby doesn"t survive, still have second) Infanticide: when adult animal kills the young: e. g. Muskrat female muskrats kill their neighbour"s young: e. g.
