Articles relating to baleen whales (parvorder Mysticeti, whalebone whales), marine mammals in the infraorder Cetacea (whales, dolphins and porpoises), which use keratinaceous baleen plates (or "whalebone") in their mouths to sieve planktonic creatures from the water. Mysticeti comprises the families Balaenidae (right and bowhead whales), Balaenopteridae (rorquals), Eschrichtiidae (the gray whale) and Cetotheriidae (the pygmy right whale). There are currently 16 species of baleen whales. Baleen whales split from toothed whales (Odontoceti) around 34 million years ago.
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