[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Rahonavis; sickle claws
Sickle Claws in Modern Birds
Not just a few species have very larger second pedal digit claws, however,
one must realize that
in _all_ birds, either the second or the first claw is the longest. In the more
it's usually the first (hallucial) whereas some terrestrial birds (have a
larger second [seen in
sereiamas, cassowaries and, I believe, kiwis and moa]). Most predatory birds
and perching birds
have subequal yet very large second and first pedal claws, and the second
through fourth are
strongly recurved. The first is also strongly recurved in strigiform,
falconiform birds, as part of the raptorial specialization.
However, only one bird has been noted to have a particularly "extensible"
second pedal digit,
and that's the seriama; they have been seen (I have, anyway) to have a second
toe that can lift
off the ground. But no modern bird or even fossil bird has a particularly
"predatory" and largest
second pedal claw, and the seriama's claw is not so recurved as to be a "true"
weapon, and neither
is that of the cassowary, so they do not qualify as "sickles." I can suggest
that no member of
Aves has a predatory sickle claw.
Jaime A. Headden
Little steps are often the hardest to take. We are too used to making leaps
in the face of adversity, that a simple skip is so hard to do. We should all
learn to walk soft, walk small, see the world around us rather than zoom by it.
Do You Yahoo!?
Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month.