Whales

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Whales are marine mammals that inhabit all the world's oceans and, unlike any fish, move their flukes in an up-and-down motion.
Toothed whales have a single blowhole and actively prey upon fish, seals and even other whales. Toothed whales have lost their sense of smell yet have developed echolocation. The other major group of whale, the bristle toothed (or baleen) whales, strain their food from water using bristle-like structures in their mouths. Baleen whales have two blowholes and females are usually larger than males. The Blue Whale, the largest living animal of all time, feeds almost exclusively on krill. Jul 5

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http://news.discovery.com/animals/dinosaurs/giant-whale-fossil.htm

Extinct Giant Whale-Eating Whale Found

- Unlike modern sperm whales, this one had teeth in both jaws and might have eaten like killer whales.
http://www.good.is/posts/the-loneliest-whale-in-the-world

The Loneliest Whale in the World

On their most recent episode of their always-enjoyable Dinner Party Download podcast, American Public Media's Rico Gagliano and Brendan Newnam featured the story of "a lonely whale with vocal problems whose love song supposedly chases lady whales away."
Humpback whale 'lobtailing' in Chatham Strait.

Humpback whales feeding in Alaska

http://www.guardian.co.uk/environment/gallery/2010/jan/05/humpback-whales-feedling-alaska#/?picture=357605562&index=2
The archaeocetes are a paraphyletic group of primitive cetaceans that include the earliest, terrestrial 'whales'.

Cetacean Palaeobiology

http://palaeo.gly.bris.ac.uk/palaeofiles/whales/archaeoceti.htm

Evolution of cetaceans

http://en.wikipedia.org/wiki/Evolution_of_cetaceans About 80 of the 87 modern species in the order Cetacea.