CETACEA WHALES, DOLPHINS & PORPOISES. FISH-LIKE CHARACTERISTICS Convergent evolution due to environmental pressure Front flippers, no rear flippers Has.

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Presentation transcript:

CETACEA WHALES, DOLPHINS & PORPOISES

FISH-LIKE CHARACTERISTICS Convergent evolution due to environmental pressure Front flippers, no rear flippers Has a dorsal fin for balance Tail called a fluke & is horizontal with up & down motion

Adaptations Streamlined body to reduce water resistance Nostrils are blowholes on top of head Blubber for insulation & buoyancy

Baleen Whales - toothless Filter feed on fish & krill Baleen –rows of fibrous plates from upper jaw Some have throat grooves that expand Examples: blue whale, humpback, right

Toothed Whales Carnivorous, use teeth to catch prey & swallow it whole, diet includes squid, fish & seals One blowhole Examples: sperm whale (largest), dolphins & porpoises

Interesting Facts Sperm whale: spermaceti in head is used as a high quality wax Also ambergris from intestine is in perfume Dives to great depths to feed on giant squid

ORCA – KILLER WHALE Distinctive black & white coloration High dorsal fin, rounded flippers Fastest whale (30 mph) Social groups - pods

Delphinids: Dolphins & Porpoises Dolphins: have a beaklike snout Porpoises: have a rounded head Live in pods Known for intelligence & playful behavior

Splash !!

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