----- Original Message -----
From: Gordon Martin Human
Sent: Wednesday, May 02, 2001 5:37 PM
To: firstname.lastname@example.org; email@example.com
Subject: RE: New Feathered Dinosaur
Just a wild guess, but wouldn't prolonged flight (including soaring)
*require* insulation of some type in any animal, due to the heat loss
associated with sustained passage of air over (relative to body volume)
large body surfaces?
Can anyone propose an animal (other than insect) that fits the above flight
profiles that is *not* insulated in some way?
Bat wing membranes are mostly uninsulated, but then again, the low blood supply probably reduces the cooling effect due to this. But are there *any* small, uninsulated, terrestrial endotherms (other than naked mole rats, which are tropical fossorial anyway, and probably live in a relatively constant temperature environment :) ) ? I think it is likely that all small ornithodirans were insulated, considering that they are unlikely to have been ectotherms.