[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Preview of new stegosaur plate paper

Jaime Headden wrote:

Well, purely display function is rare in nature and usually restricted VERY sexually dimorphic animals, among them some mammals and birds. Obviously, waterfowl, landfowl and ratites are very dimorphic birds whereas other birds tend to exhibit monomorphic body form, especially in the "higher land bird" groups such as parrots, pigeons, passerines, and raptors. In these birds,
behavior plays a more important role in sexual selection than does morphology (well, not entirely, they may still be visually dimorphic, such as coloration).

The birds-of-paradise, which are passerines, are one very notable and very ostentatious exception to this 'monomorphic' body form. Other strikingly dimorphic passeriforms include the cock-of-the-rock and relatives (Cotingidae) and the lyrebirds (Menuridae).