Tuesday, July 26, 2011
Warbler Guy, When does Kirtland’s Warbler migrate south? The Kirtland’s Warbler migration is early? Or does Kirtland’s Warbler migrate in fall?
Actually, Jeremy (in Detroit), many of the Michigan-based nesting Kirtland’s Warblers disperse and migrate by July (and no later than August). Look for them in mid-July where they nest in central Michigan counties and you’ll often be out of luck. In fact, their nesting period is a small window of time, typically from their mid-May arrival through the subsequent next six to eight weeks.
Then dispersal may happen before mandatory (or obligate) migration occurs. Think of dispersal as local to short-distance travel away from the nesting area. This interim period involves feeding and molting prior to the Kirtland’s long night-time migration to the Bahama Islands.
Followers of this blog may also know that Kirtland’s Warbler now nest annually in Wisconsin. (See articles from May and June, 2011, below.) Wisconsin Kirtland’s Warbler individuals also usually leave their nesting grounds in July. They, too, eventually migrate to the Bahamas, thereby joining Michigan nesters for the non-breeding season.
How many Kirtland’s Warblers exist? Probably no more than approximately 1,825 to 1,850 males, according to recent combined breeding bird studies that incorporate totals from Michigan and Wisconsin. One annual nesting spot in Ontario also occurs for this federally endangered wood-warbler.
Sunday, July 17, 2011
What's this photo's ID (of a hybrid warbler recently present at Summer Lake in south-central Oregon)?
(photo (c) Jim Arneson via flickr)
My guess is as good as yours, though my initial thought is a form of Canada Warbler, given the trace of the necklace and eye ring typical of a classic male Canada Warbler.
Other field marks suggest Black-throated Blue, American Redstart and either Mourning or MacGillivray's.
Someone suggested the cross/intergrade appearance is most closely alligned with Junkin's Warbler, meaning it shows
field marks associated with Mourning and Kentucky.
....and the BIG hint for the nearby photo is its name begin with "Black-......"
(Remember, it's a West Coast wood-warbler species)
You can enter your answer in the "comments" section below.
Or you can vote at the nearby quiz on the right column.
Monday, July 4, 2011
Warbler Guy, what are the new warbler name changes? Do only the scientific names change and the common names remain the same?
Excellent question, Noah. (Warbler "taxonomy tree" name chart is difficult to read here, but is easier to see at the
link noted below in the final sentence.)
The honest and best answer is for you to read David Sibley’s account (David Sibley's blog = http://www.sibleyguides.com)
His summary of the warbler name changes is the best account I’ve read.
You can see it at:
Happy 4th of July...(As we celebrate, by the way, millions of wood-warbler newborns are flying for the
first time today in northern latitudes. Some (such as LA Waterthrush that nested in the mid-Atlantic) are already dispersed and migrating nearby their nesting grounds and/or south by this time and this month.