Date: Thu, 29 Nov 2007 22:29:41 +0100
From: Tommy Tyrberg <email@example.com>
Subject: Re: Nesting birds (was RE: Marsupial forelimbs... or rather hindlimbs)
All those groups are *primitively* ground-nesting. Tree-nesting has evolved independently any number of times. As a matter of fact you can find the odd tree-nesting species in most ground-nesting bird families, for example :
Gulls: Common Gull often nests in trees, Bonaparte's Gull is an obligate tree-nester
Waders: Green Sandpiper is an obligate tree-nester
Auks: Marbled Murrelet nests in trees
Geese: Greylag Goose sometimes nests in trees
Gannets: Abbot's Booby is a tree-nester
Galliforms: Many Cracids are tree-nesters
I can't offhand think of any tree-nesting tinamous or albatrosses/petrels/shearwaters.
Non-volant birds (penguins, ratites) are obligate ground-nesters for obvious reasons and so are Grebes and Loons, since they are so strongly adapted to swimming that they can hardly walk on land, much less in trees.
It works the other way around too, there are at least two obligate ground-living (and ground-nesting) wood-peckers.
At 19:52 2007-11-29, you wrote:At 08:33 AM 27/11/2007, Thomas R. Holtz, Jr. wrote:Tinamous, ratites, galliforms (basally), and anseriforms (basally) seem to all be ground nesters.
A number of Anseriformes (eg all whistling-ducks Dendrocygninae, wood ducks Aix, and many diving ducks) nest in tree cavities.
Ronald Orenstein 1825 Shady Creek Court Mississauga, ON L5L 3W2 Canada 905-820-7886 905-569-0116 fax firstname.lastname@example.org