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Psittaciformes - Wikipedia, the free encyclopedia |
 | | The order Psittaciformes includes about 342 species of bird which are generally grouped into two families: the Cacatuidae or cockatoos, and the Psittacidae, the parrots. |
 | | The majority view, however, is that the Cacatuidae are quite distinct, having a movable headcrest, different arrangement of the carotid arteries, a gall bladder, different skull bones, and not having the Dyck texture feather composition which, in the Psittacidae, scatters light in such a way as to produce the vibrant colours of so many parrots. |
 | | At this point, however, is found the first unambiguous parrot fossil (as opposed to a parrot-like one), an upper jaw which is indistinguishable from that of a modern white cockatoo. |
| en.wikipedia.org /wiki/Psittaciformes (610 words) |
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