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Re: Sifaka and Chukar Behavior: Trees Down or Ground Up?



----- Original Message -----
From: "Jeff Hecht" <jeff@jeffhecht.com>
Sent: Friday, January 24, 2003 10:46 PM

> How different is it?

J. R. Speakman & S. C. Thomson: Flight capabilities of *Archaeopteryx*,
Nature 370, 514 (18 August 1994)

"At the point a quarter of the way up from the feather tip, the high ratio
was maintained across the first four primaries; [...]"
"Only three specimens of *A. lithographica* have the feathers sufficiently
preserved to measure vane asymmetry: the Berlin and London specimens and the
single feather. The single feather has an asymmetry of 2.2 at the 25% point,
but where this feather comes from in the wing, and indeed whether it is from
the same species, is unknown^6. In the Berlin and London specimens the
feathers are embedded in wings and therefore overlap each other. The distal
ends of some of the feathers are sufficiently exposed to make measurements
of vane asymmetry at the 25% position from the feather tips. We measured
primary feathers 4,5 [sic] and 6 of the left wing of the Berlin specimen and
primary feathers 3 and 4 from the left wing of the London specimen. Vane
asymmetry averaged 1.44 for the London specimen and 1.46 for the Berlin
specimen".

Ref. 6 is Owen, 1864 -- which mistakenly assumes that the type of *A.
lithographica* is the single feather and therefore describes the London
specimen as the new species *A. macrura*, a junior objective synonym of *A.
lithographica*.