"Anyone happen to know the frequency of (interior) blue grouse hooting?
I
recall video taping them with a cheapo camera & stock mic. The bird was
strutting around on the ground, hooting occasionally. I remember
thinking
how low the sound was. When I watched the tape later, it was a silent
film!
The mic didn't even pick it up!
Mark Phinney"
I have sat on the ground recording an interior blue grouse hooting at 10
meters and found it hard to hear because it is so quiet. The recordings
of interior and coastal subspecies are on my Stokes guide to western
bird songs. I'm not with my equipment now but it seems to me that the
center tone was perhaps around 60-100 Hz. To my ear the interior
subspecies sounds a bit goofy. As I heard other recordings I wondered
if my birds in Utah had the same goofy syncopation - they do.
All through the spring I hear the infrequent single low hoot of a blue
grouse. Can anyone tell me the biology of this? Is it male or female
and what is the purpose of the call?
Thanks,
Kevin Colver
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