A few weeks back, during the discussions about hummingbirds
and flowers, Wayne Weber referred to the paper published by
Jim Pojar for the now defunct journal Syesis.

That paper is now on-line at:
http://columbia-pacific.interrain.org/ahscience/humm/pojar.html

--
Mike Patterson Alas, to wear the mantle of Galileo,
Astoria, OR it is not enough to be persecuted
celata at pacifier.com by an unkind establishment,
you must also be right.
---Robert Park
http://www.pacifier.com/~mpatters/bird/bird.html