2. Are whales tetrapods?
~ 9.8 feet long

3. Ancestry of Suborder Pinnipedia – Hypothesis 1
Ursids
Otariids
Phocids
Mustelids
Weasel, otter, ferret,
skunk-like ancestor
Bear-like ancestor
Evidence
Biogeographical
Morphological
Nojima (1990)

4. Ancestry of Suborder Pinnipedia – Hypothesis 2
Ursids
Otariids
Phocids
Mustelids
Evidence
Biomolecular
Morphological – recent
Árnason et al. (1995)
Bear-like ancestor

5. Order Cetacea
Whales
Porpoises
Dolphins

7. Cuvier’s beaked whale Sperm whale Maximum dive time – 138 minutes
Maximum dive depth – 9,800 feet
Sperm whale
Maximum dive time – 90 minutes
Maximum dive depth – 7,300 feet