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| | Psittaciformes - Wikipedia, the free encyclopedia |
 | | Some authorities regard the lorikeets as a third family rather than part of the Psittacidae, or lump the cockatoos into one giant family. |
 | | 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. |
 | | Birds of the parrot families can be found in most of the warmer parts of the world, including India, South East Asia and West Africa, with one species, now extinct, in the United States (the Carolina Parakeet). |
| en.wikipedia.org /wiki/Psittaciformes (610 words) |
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