LIFESCI 1 Lecture Notes - Lecture 24: Synapomorphy, Eutheria, Krill
Document Summary
Allows for them to live in cold environments. Ability to provide young with extensive parental care. Mammals have fewer offspring, increased parental care. Endothermy: regulate body temperature with internally generated heat. Beaks adapted to the food of each bird. Produce milk but do not have nipples: have glands on their body that secretes milk off onto fur. Leaves birth canal and crawls up into pouch and attaches to nipple. Feeds off mother and finishes development in pouch. Kangaroos continuously have one offspring each stage. But can have multiple offspring at once. Resulted in a diversity of marsupial mammals in australia that resemble the eutherian (placental) mammals in in other parts of the world. Retain embryo within body for much longer. Without portability you are just sitting, limits what parents can do. Diversity in feeding methods results from modifications to the jaw. Adaptation of jaw is a response to different niches.
