Date: 9/8/17 8:32 am
From: Doug Shaw <dougshaw09...> [northbaybirds] <northbaybirds-noreply...>
Subject: Re: [NBB] Fw: Bodega Bay - Raving with Ravens
Hi All,

Wow, that is a high concentration of Ravens! As for bird calls and songs recognition sometimes it may be a mammal you are hearing. Since many of us have smartphones if you hear something you don't recognize record it on your phone. If you use Ebird you can upload audio to a report.

Good Birding,
Doug Shaw
Santa Rosa, CA

----- Original Message -----
> On Friday, September 8, 2017 7:29 AM, Dan Nelson <birdsurf64...>
> wrote:
> Hi Birders,On Wednesday Sept. 6 there were unprecedented numbers of Common
> Ravens staging on the coast  near Bodega Bay. At one point, I counted 45
> circling in the air at one time, over Bodega Head near Owl Canyon and
> Campbell Cove. At hour later, another large group was just W. of Valley
> Ford.
> While not a rare species, I thought this might be worthy enough to report
> NBBer's.  Or maybe not.
> At any rate, I wanted to discuss the well-known "knocker" call, which is part
> of the regularly-heard repertoire given by CORAs - but slightly less
> frequent.  This is a louder, very percussive version of a normal raven call,
>   and transmits much further distances through open space,. This call is a
> very important component of Raven communication, and is often heard at
> places such as Bay Hill Rd., Jenner Headlands, or Marin Headlands. It is
> usually uttered aerially, in flight, and virtually always DOUBLED.
> CAUTION   : A few of the CORAs I reported were youngsters, and have been
>  heard giving their doubled, youngster version of the "knocker" call.  These
> calls can be heard daily at Campbell Cove, Owl Canyon and vicinity if one
> puts in time to listen. DO NOT CONFUSE this call with the pre-song clucking
> of Yellow-billed Cuckoo. The large influx of CORAs may be associated with
> the explosion of Voles / Microtis #s on the coast, also attracting Barn Owls
> and others.... which keep the ravens squawking .
> Fun times, good birding- Dan Nelson, Sonoma County

Posted by: Doug Shaw <dougshaw09...>

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