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. D. @# O& S* ~& @) S, FCOVER The rock pigeon (Columba livia) exhibits spectacular variation among more than 350 different domestic breeds. The adult male Old Dutch capuchine shown here is one of many breeds with a crest of reversed feathers on its head and neck. See page 1063 for a description of the genetic origins of the head crest and the relationships among breeds. For the story behind the cover, go to http://scim.ag/cov6123. Photo: Sydney Stringham9 J0 B# v& n4 y
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发表于 2013-3-1 20:01
发表于 2013-3-4 14:25
