DBQ answers

9 04 2015

All respondents quickly recognized Bird A’s distinctive beak–heavy, straight and dark. This is a Common Loon. I wanted to show this picture mainly since it makes visible the very slight mismatch in length between upper and lower beak that one can rarely appreciate in a live bird at a distance. In fact, the upper bill does project just a small way past the lower (the bill is pictured upside down in our Bird A).

Bird B, found by Sue Bickford in Maine this month.

Bird B, found by Sue Bickford in Maine this month.

As for Bird B, where we have only a foot in this image, I was intrigued by the coloration here. The foot looks like a duck’s, and in fact, there are red or dark orange footed ducks in the world, namely scoters and mergasers. For more on that, see previous post on brightly colored feet. There are also terns and guillemots that may have red feet too, but our Bird B looks to have a duck foot to me. So Bird B here has a reddish looking foot. But something about it was bothering me. I could not quite square the color with the shape and proportion of the toes. I could not square this bird with a scoter, basically. Wouter and Edward had the same conversations in the comment thread as what went on in my mind–is this foot actually red, or has the desiccation process altered the original color? Then, fortuitously, I received a photo of a different bird: a headless carcass found by Louise Nelson, walking Plum Island in Massachusetts. The feet on this bird looked rather similar in proportions and color, and here we had more information on the rest of the bird, though not the head. But we Seanetters know not to ask too much. Here’s that bird’s picture:

Headless bird with vaguely red feet. If you squint? (Photo: L. Nelson)

Headless bird with vaguely red feet. If you squint? (Photo: L. Nelson)

To me, those feet also had a sort of dusky red hue to them, similar to Bird B. At the risk of dragging this out overlong, what do you think of that, readers? Are you convinced? And if yes, then what would that make Bird B? I have my thoughts, naturally.

Finally, Bird C, which generated some healthy debate as well. The two candidates were American Wigeon and Red-breasted Merganser (two votes for the latter, from Wouter and James Taft). Much hinges on how we interpret what we’re looking at in this case–the twisted up wreckage of these wings makes it challenging to sort out what’s upper wing, and what’s under, what’s covert and what’s secondary. Overall, a wigeon underwing is fairly light, with some brownish feathers along the margin of the wing’s leading edge. That is consistent with what we see in Bird C, but is also consistent with a Red-breasted Merganser’s underwing. A key difference, as both Wouter and Edward pointed out, is whether we are seeing a white speculum on the secondaries of the underwing or not. The merganser has one; the wigeon does not. I can see the problem though–might that white patch actually be not the secondaries themselves, but  the coverts, and the dark secondaries have gotten somewhat bunched up behind them?

Then we have that view of the very disheveled right wing, where all we can really make out is that there is a large white patch. Wigeon and merganser both have that. So, what to do? The answer–go back into the database and discover that Wendy Stanton actually took more than one photo of this specimen. Here’s the other:

SEANET gods' blessings on Wendy for taking this very illuminating photo.

SEANET gods’ blessings on Wendy for taking this very illuminating photo.

That helps rather a lot, no?

Advertisements

Actions

Information

One response

10 04 2015
Edward

Bird B: I can live with the Black Duck theory a stated by John Stanton. Red legs, brown mottled undertail and dark grey tail feathers. Could well be a black duck. Looks a bit dark for a Mallard.
And Bird C with the white wing patch? The black stripe across it is very much Red-breasted Merganser, right?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s




%d bloggers like this: