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Plovers

Semipalmated Plover Migration Winds Down

10-31-18 semi-palmated plover_U1A1025During the peak of their migration in the fall (August and September), Semipalmated Plover sightings occur inland but are especially concentrated along the East coast.  Sightings are decreasing now as we approach the tail end of their flight from their Arctic and sub-Arctic breeding grounds to their wintering grounds which range from the southern U.S. through southern South America.

In general, plovers (Charadriidae) are small to medium-size, plump shorebirds with long wings and short necks and rounded heads.  The Semipalmated Plover, during the breeding season, has a black crown, eye patch and single breast band.  These areas are brown in nonbreeding adults (pictured).

Fortunately, there is no evidence that the estimated breeding population of 200,000 birds is diminishing. According to the Cornell Lab of Ornithology, “The Semipalmated Plover is among the few plovers whose numbers are apparently increasing, perhaps owing to its versatility in food and habitat choice, its wide-spread coastal winter distribution, or its habitat expansion in the sub-Arctic as a result of disturbance by both humans and arctic geese.”

For those curious about this shorebird’s name, “semipalmated” in a wading bird’s name indicates that its toes are webbed for part of their length (barely detectable in photo, but if you look hard you’ll see partial webbing in the left foot).

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First Killdeer Returning to Northeastern Breeding Grounds

3-1-16 killdeer 062Killdeer that breed in the southern half of the U.S. are year round residents, and do not migrate, but in the northern half of the U.S. killdeer are migratory. Their wintering range extends across the southern tier of states, through Mexico and the Caribbean and along the coastal regions of western South America (Columbia, Venezuela, Ecuador and Peru). Killdeer that breed in the Northeast overwinter in Gulf and southern states that border the Atlantic Ocean.

The first returning killdeer have been sighted in Vermont. While the spring migration of killdeer is early, it is also prolonged, peaking in late March or early April in New England. Killdeer migrate during the day as well as at night, in flocks of 6-30 birds. When they stop to rest and/or forage, the birds typically do not go within 13 to 20 feet of each other, and are met with aggression from other flock members if they do. Once on their breeding grounds, killdeer are even less tolerant of each other. The courtship behavior in one pair often elicits aggressive behavior from neighboring pairs.

Now is the time to keep ears and eyes open for this inland-nesting shorebird. Corn fields, lawns and parking lots are a good place to start. For a perfect example of onomatopoeia, listen to Lang Elliott’s killdeer recording: http://www.langelliott.com/mary-holland/killdeer/ (Sound recording © Lang Elliott – langelliott.com)

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Avian Toe Arrangment

3-17-14 mourning dove tracks 004As opposed to humans, who use the entire bottom of their feet for support, birds stand and walk only on the ball of their foot and with their toes. When you look at a bird’s leg, what appears to be its knee, bending backward instead of forward as it does in humans, is actually its heel.

Most birds have four toes, arranged differently according to the life style of the bird. Songbirds, as well as most other birds, have three toes pointing forward and one pointing back. Most woodpeckers, being active climbers, have two toes pointing in each direction, which provides added clinging support. The outer toe (of the three forward toes) of ospreys and owls is reversible, so that they can have two toes in back should they need to get a better grasp on slippery fish or other prey. Some birds that do a lot of running, such as sanderlings and most plovers, have only the three forward toes. (Photo: Mourning Dove tracks)

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