Date: 3/11/17 5:57 pm From: Virginia Scott <virginia.h.scott...> Subject: [obol] Re: Swan ID
I volunteer at Ridgefield NWR, and identification is difficult for me. We have large numbers of Tundras that winter here. Not all Tundras have yellow lores, as you know, and Roy is right about the size. We usually have Trumpeters mixed in with the Tundras, and the primary way we find them is by voice identification. I'm sure better birders than I could be clearer about identification, but even having seen them so often together, I find it difficult. Another factor is that they're usually too far away to get a really close look, even with good binoculars. I've heard more Trumpeters this winter than in previous years, but that may be just my own experience. They will be leaving the refuge soon; the numbers are already dwindling. I always miss them when they're gone. When they're here you can hear them from all over the refuge. It's wonderful.
Virginia Scott Port land
On Fri, Mar 10, 2017 at 3:49 PM, Roy Lowe <roy.loweiii...> wrote:
> Use some caution in using size to differentiate Tundra and Trumpeter > swans. Tundra Swans breeding on the Alaska Peninsula are large with their > body size and weight overlap with Trumpeters. Some marked birds from this > population have been observed on the Oregon coast in the past. > > Roy > > > > > On Mar 11, 2017, at 10:01 AM, Lars Per Norgren <larspernorgren...> > wrote: > > > > * > > > > These measurements are averages, so as with Accipiters there's room for > overlap. Patient folks sometimes find small groups, family sized, of > Trumpeters in a Tundra flock. Dave Irons pointed out a few days ago that > these Trumpeter families will stick together within that flock. I'm > inclined to believe that Tundra Swans also can keep close company with > close relatives in these big flocks, we humans often can't see the > difference. Bewick's Swans have more distinctive yellow patches on the > beak, making it possible to track some individuals without human markings, > collars, leg-bands and so forth. > > On Mar 11, 2017, at 9:23 AM, Tim Johnson wrote: > > > >> Another thing to consider when identifying swans, the trumpeter is a > much larger swan than the tundra. Sibley's field guide shows the trumpeter > size as follows: Length 60", Wing Span 80", Weight 368 ounces. Compare that > to the tundra: Length 52", Wing Span 66", Weight 230. > >> > >> It helps if the all the swans being identified are mixed together. If > there are any trumpeter swans in the mix they should be significantly > larger than the tundras. > >> > >> My experience is that the tundras and trumpeters don't form mixed > flocks, however my experience seeing them together is fairly limited. > >> > >> Tim Johnson > >> Salem, OR > > > > POST: Send your post to <obol...> > > JOIN OR QUIT: http://www.freelists.org/list/obol > > OBOL archives: www.freelists.org/archive/obol > > Contact moderator: <obol-moderators...> > > > > > POST: Send your post to <obol...> > JOIN OR QUIT: http://www.freelists.org/list/obol > OBOL archives: www.freelists.org/archive/obol > Contact moderator: <obol-moderators...> > >