At 05:39 PM 10/6/2003, you wrote:
>does anyone care or is anyone collecting those thin incomplete fall
>calls that migratory birds make?
>
>They may be HY related or just a partial weak call of the spring.
>But they are the same from year to year and don't quite make it to
>being a true whisper call.
Some of it is HY (Hatch Year) birds, and some of it is the fact that many
birds' gonads go through a mini spring swelling in the early fall that
produces a brief flush of mating behaviors - most of them truncated to some
extent. The Red-wing Blackbirds' HY males around my place are starting to
sing an approximation of the adult song and the HY White-crowned Sparrows
are doing the same.
Doug
Doug Von Gausig
Clarkdale, Arizona, USA
Moderator
Nature Recordists e-mail group
http://groups.yahoo.com/group/naturerecordists
[Non-text portions of this message have been removed]
________________________________________________________________________
________________________________________________________________________
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
|