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The phylogenetic distribution of large body size is young. A reconstruction of body length evolution under a simple Brownian motion model shows that large (more than 10 m) body size evolved independently in the bowhead (Balaena) and right (Eubalaena) whales, several lineages of Balaenoptera, and though not as pronounced, in the grey whale (Eschrichtius). The extant pygmy right whale Caperea is also large relative to its cetotheriid relatives.
