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Re: T.Rex Feather Skepticism
Good point; though altriciality is the ancestral condition for
passeriform birds. The more useful question would be whether passerine
birds nesting on the ground tend to become more precocial than those
that nest in trees. There is variation within passeriform
altriciality, after all.
There have been several ground-nesting pigeon lineages, but most nest
in removed locations (several are/were island forms). As for
passerines, the vast majority still nest on elevated locations, I am
pretty certain, though there are some very significant exceptions (such
as the larks already mentioned).
Overall, phylogenetic constraints have to be taken into account, but
still very helpful and informative. Thanks for the post.
On Thursday, September 15, 2005, at 02:29 PM, Ronald Orenstein wrote:
At 11:35 PM 9/14/2005, T. Michael Keesey wrote:
are any ground birds altricial?
All of the Passeriformes are altricial, and many nest on the ground,
including birds, including most of the larks that are highly
terrestrial. In fact, with Passeriformes outnumbering all other birds
put together, I would suspect that the number of ground-nesting birds
with altricial young is quite high.
There are also ground-living woodpeckers, pigeons, and others besides
those mentioned, including some that nest there (or at least on ledges
or in crevices).
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