Saturday, April 19, 2014

Cape May Warbler


Orchard Oriole


The Orchard Oriole swaps the typical flame-orange of other orioles for a deep, burnished russet. Hopping among riverine shrubs or scattered trees, male Orchard Orioles sing a whistled, chattering song to attract yellow-green females. The smallest of North America’s orioles, it gleans insects from foliage and builds hanging, pouchlike nests during its brief breeding season, and then heads back to Central America for the rest of the year. Orchard Orioles also feed on fruit and nectar in orchards, gardens, and elsewhere.

On their favorite habitats—along river edges, for example—Orchard Orioles nest in groups, often with multiple nests in a single tree. On less suitable habitats, however, they tend to be solitary. Orchard Orioles migrate north late in the spring and head southward early, with some returning to their wintering grounds as early as mid-July. Because of the short breeding season, researchers have trouble distinguishing between breeding orioles and migrating ones in any given location. The Orchard Oriole eats nectar and pollen from flowers, especially during the winter. It is a pollinator for some tropical plant species: as it feeds, its head gets dusted with pollen, which then gets transferred from flower to flower. Sometimes, though, the oriole pierces the flower’s base to suck out the nectar—getting the reward without rendering a service to the plant.

Orchard Oriole Range Map

Short-billed Dowitcher


Black-crowned Night-Heron


Black-crowned Night-Herons are stocky birds compared to many of their long-limbed heron relatives. They’re most active at night or at dusk, when you may see their ghostly forms flapping out from daytime roosts to forage in wetlands. In the light of day adults are striking in gray-and-black plumage and long white head plumes. These social birds breed in colonies of stick nests usually built over water. They live in fresh, salt, and brackish wetlands and are the most widespread heron in the world.

The familiar evening sight and sound of the Black-crowned Night-Heron was captured in this description from Arthur Bent’s Life Histories of North American Marsh Birds: “How often, in the gathering dusk of evening, have we heard its loud, choking squawk and, looking up, have seen its stocky form, dimly outlined against the gray sky and propelled by steady wing beats, as it wings its way high in the air toward its evening feeding place in some distant pond or marsh!” Scientists find it easy, if a bit smelly and messy, to study the diet of young Black-crowned Night-Herons—the nestlings often disgorge their stomach contents when approached. Black-crowned Night Heron nest in groups that often include other species, including herons, egrets, and ibises. A breeding Black-crowned Night-Heron will brood any chick that is placed in its nest. The herons apparently don’t distinguish between their own offspring and nestlings from other parents.

Black-crowned Night-Heron Range Map

Northern Waterthrush


A bird of northern forests, the Northern Waterthrush sings its loud, ringing song from wooded swamps and bogs. It can be seen on migration bobbing its tail near wet spots in parks or back yards.

The Northern Waterthrush is territorial in both winter and summer. On the breeding grounds the male proclaims its territory with its loud, ringing song. On the wintering grounds it uses its "chink" calls, together with chasing and fighting, to keep out intruders. The Louisiana and Northern waterthrushes are very similar species whose breeding ranges overlap slightly. Their songs and their habitats, while similar, differ significantly. The pitch of the beginning notes of the Louisiana's song usually descend, just as does the hilly stream that is its preferred habitat. The Northern Waterthrush prefers bogs and waters that are flat, just as its beginning notes stay on the same pitch

Northern Waterthrush Range Map

Semipalmated Sandpiper


An abundant small shorebird, the Semipalmated Sandpiper breeds in the Arctic and winters along the coasts of South America.

Semipalmated Sandpipers from eastern populations probably undertake nonstop transoceanic flights of 3,000 - 4,000 km (1,900 - 2,500 mi) from New England and southern Canada to South America, powered by extensive fat reserves. The Semipalmated Sandpiper gets its common name from the short webs between its toes ("palmated" means webbed). The Western Sandpiper is the only other small sandpiper with similarly webbed toes.
Semipalmated Sandpiper Range Map