PSL280H1 Lecture : marine mammal notes 1.docx
Document Summary
Any aquatic mammal that spends part or all of its life in water ( fresh & marine salt water) Currently approximately 126 living species used to be 128 but 2 species went extinct , depends on classification. Teeth & 1 blow hole while swimming more efficient to just put your head over water with ur blow hole to take breath. When compared to humans/terrestrial mammals, marine mammals have: lungs which can compress & spring open some whales can compress lungs to 10% of original size much more then humans. Shark whale not a mammal a fish. Penguin bird, with feathers no marine mammal have feathers but hair. Uses to chew on hard shell animals, canines. Class mammalia: incules all species that are described as being mammals. Body covered with hair which molts (sheds), skin containeing various glans, mouth with teeh, 4 chamber heart. # of visitors to zoos & awuaria +175 million ppl 2010.
