Archive for Juvenile or Immature

American Robin fledgling 5/25/18

This little bird was still less than 100′ away from its nest in the yew bushes up where the cars park when I heard one of it parents clucking loudly and came to investigate. It probably had fledged in the previous 5 or 10 minutes, and still sporting downy fuzz,  but as it moved further way from its nest forever I grabbed my camera and caught a few snaps as it entered the great unknown. American Robins (and Eastern Bluebirds) are arguably spot-breasted thrushes like their close cousins the Wood and Hermit Thrushes, only they lose their spots in adult plumage.

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Black-bellied Plover juvenile 11/4/16

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Black-bellied Plovers breed on the Arctic islands and coasts of North America and Asia, wintering as far south as Argentina, South Africa, southern Asia, Australia, and even New Zealand. Here they are migrants just passing through, though you can find some wintering as far north as Cape Cod. Outside of North America  they are called Grey Plovers, even though they are the exact same species. Adult breeding plumage sports the bold black bellies, while winter adults are similar to juveniles like this one, only grayer and not as strongly speckled. These shorebirds belong to the genus Pluvialis—the rain plovers—of which there are 4 species around the world.

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Great Blue Heron juvenile 9/27/16

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Juvenile Great Blues, like other herons and egrets, roam far and wide in all directions after fledging. In coastal New Hampshire and Maine most have migrated farther south by November, but not very far, after a warming spell of only a few days or in milder winters with little ice, it’s not unusual to see Great Blues in any of the winter months. Juvenile plumage is dingier and less bold than adults, for example the crowns of juveniles are slaty gray instead of the sharply defined black and white of adults.  Great Blues belong to the genus Ardea, one of about a dozen species of large stalking herons that together fill much the same wetland niches around the world.

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Yellow-bellied Sapsucker juve male 9/26/16

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One of New England’s two migratory woodpeckers (Northern Flicker being the other), Yellow-bellied Sapsuckers drill neat holes in tree trunks to lick the sap from. The sapwells are arranged in neat rows and are regularly tended to keep the sap flowing. Trees with a high sugar content like birches and maples are favored but many species of trees are utilized such as this American Larch. Juveniles are duller brown and drabber than the black and white adults. This juve is showing a few red feathers below the bill indicating its sex is male, females only sport red above the bill. In adults the red patches aren’t just hints but bright and well defined.

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Sanderling juveniles 9/8/16

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Sanderlings are one of the small shorebirds you’ll often see running back and forth with the waves on the beach. They stitch the wet surface with their bills like two-legged sewing machines. The sand is softened by a receding wave, allowing the birds to probe deep for isopods and other marine invertebrates before the next wave approaches. Sanderlings are one of the few New England sandpipers we can see in all plumages. These white and spangle-winged birds are the juveniles we see migrating south in the fall, the slightly more colorful adults have already passed through in August. The next plumage for these birds will be a more uniform winter white with soft light gray wings, followed in the spring by the rusty speckled adult plumages (male and female adults being slightly different). Most migrating Sanderlings are on their way to South and Central American beaches, but a few small flocks will overwinter on the sandy beaches of the southern Maine coast.

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Baird’s Sandpiper juvenile 8/31/16

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My immediate impression of this sandpiper was that it was a Baird’s, really no other peep has the same golden tones, noticeably warmer than the more common Semipalmated Sandpiper. To confirm, check out how the wingtips extend well beyond the tail, the only other long-winged peep is the similarly sized White-rumped Sandpiper, but that’s a much grayer bird than this. Baird’s Sandpipers migrate to the west coast of South America down the Central Flyway, west of the Mississippi, but every year a few strays wind up coming south down the Atlantic coast, and this is one of them. 

 

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Ruby-throated Hummingbird juve 8/8/16

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In August my backyard is full of Ruby-throated Hummingbirds visiting the feeder and garden flowers, all diving and chasing each other. This juve among the yucca flowers was chased off by an adult male only moments after my shutter clicked. They are inquisitive but aggressive, and they are peculiarly solitary compared to other birds. For one thing, Ruby-throated hummers don’t form pair bonds. Migrating males arrive early and take the best territories, while females arrive later and set up their own separate territories. Courtship only lasts a few moments and both sexes may mate with several partners in neighboring territories. Females do all the nestbuilding, brooding, and chick-rearing, and can raise several broods in a summer. Males begin migrating south in July, many males you see visiting feeders today are migrants from farther north and many or our summer breeding males are already on their way to Mexico, Central America, and the Caribbean.

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