On 9 May 2011 several birders saw and heard a strange oriole in Georgetown, South Carolina (photos here). They identified it as a Scott’s Oriole, a first state record and the first spring record in the east. When other birders saw the photos, some questioned why the bird was not an Orchard Oriole (common in […]
A “mystery” oriole and the limitations of identification by impression Read More »
The Mexican Duck was formerly considered a species (Anas diazi), and is currently lumped with Mallard (as subspecies Anas platyrhynchos diazi), but recent DNA studies suggest that Mottled Duck (not Mallard) is its closest relative (McCracken et al. 2001). Whatever its genetic background, it is clear from field observations that Mexican Ducks and Mallards interbreed
Intergradation between Mexican Duck and Mallard in Arizona Read More »
Note: I’m preparing posts on the range and identification of Brant subspecies, which will help make the following more understandable to those who are not already well-versed in the intricacies of Brant. Over the last fifteen or so years I have seen several odd “gray-bellied” Brant along the US Atlantic coast. This spring I finally
Three interesting Brant from Massachusetts Read More »
Identifying subspecies adds richness to your birding by adding another layer of understanding. What’s more, during spring migration, behavior can offer a quick and fairly reliable clue to use when distinguishing local breeders from migrants. This is simply an extension of a bit of advice often given for identifying shorebirds: to watch for birds around
Identifying subspecies by behavior – Savannah Sparrow Read More »
The Green-winged Teal (known as Common Teal in English-speaking parts of Eurasia) is currently considered a single species by the AOU, but two subspecies are distinctive in adult male plumage and are split into two species by many authorities. Green-winged Teal (American) – Anas crecca carolinensis Common Teal (Eurasian) – Anas crecca crecca ((Common Teal nests in
Distinguishing Green-winged and Common Teal Read More »
Summary The two subspecies of Purple Finch are fairly distinctive with well-defined ranges. They are best distinguished by overall impression of color and pattern, and more objectively by details of back and head pattern. Virtually all individuals should be safely identifiable in the field, but the frequency and extent of intergradation is unknown. Eastern Purple
Distinguishing the subspecies of Purple Finch Read More »
Not really. Only under ideal conditions and with reference to location. Mountain Chickadee is found throughout much of the montane coniferous forest of the west, and up to seven subspecies have been described and named. These were sorted by Behle (1956) into Rocky Mountain, Great Basin, and California groups which differ in a complex mosaic
Can subspecies of Mountain Chickadee be identified in the field? Read More »
It’s early morning and you’re out on a bird walk following your guide under a gray sky. A flock of small songbirds flits over the distant treetops. The birds reveal no field marks (or so you think), so you’re surprised and mystified when the birder leading the group says matter-of-factly, “Eight House Finches.” “How is
Identifying songbirds by flocking behavior Read More »
Caribbean Coot Fulica caribaea (found sparingly and locally in the West Indies from Hispaniola south and east to the coast of Venezuela) is virtually identical to American Coot except for its all-white frontal shield (Roberson and Baptista, 1988). ((The claim by Brisbin and Mowbray (2002) that American and Caribbean coots can be distinguished by the
The ‘Caribbean’ Coot in North America Read More »
In a previous post I wrote about differences in the black-and-white pattern on the neck of Downy and Hairy Woodpeckers, and in comments there Dan Lane reminded me of a difference in the pattern of red on the nape of males, that I’ve heard about over the years but never really investigated. Male Downy Woodpecker
Another clue for identifying Downy and Hairy Woodpeckers Read More »