BIO 1130 Lecture Notes - Lecture 1: Marsupial, Macroevolution, Platypus

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Feathers were common in dinosaurs not just birds. The feather becomes a light weight keratinized structure in which you can increase your body surface enough to y. Feathers combined with a lightening of the body structure. Birds also minimize their number of bones by fusing them together [decrease the number of separate bony elements] No bony jaw- it is now keratinized beak. Also, centred the whole body mass around one center of gravity to which we attached the muscles to generate the lift for ight. Have also produced hollow bones (holes in the bones) (cross-crossing struts in the hollow inside which are all the is needed to withstand pressure making bird bones are strong in one direction and fragile in another) They now do parental care for their young. Towards the end of the dins there may have been parental care as well. Allows us to use hair as a way to thermoregulate.