An online resource based on the award-winning nature guide

Migration

Hermit Thrushes Migrating & Stopping Over to Refuel

10-7-14 hermit thrush  092The Hermit Thrush is often one of the last thrushes to leave its breeding grounds in the fall — peak migration is between the end of September and the middle of October. High pressure, clear skies and wind from the north usually produce many sightings of this bird at this time of year. Unlike many other species of thrushes that winter in Central or South America, the Hermit Thrush is not a long distance migrator, and does not cross the Gulf of Mexico. Approximately one-third of all migratory flights end after only two to three hours of flight. Typically it makes several two-to-six-day stopovers to refuel before reaching its wintering grounds in southern U.S. and Mexico.

The Hermit Thrush is a nocturnal migrant, often departing roughly half an hour after sunset (over half of departures occur within 60 minutes after sunset and none after midnight) with most flights ending about 40 minutes before sunrise (none later than 20 minutes before sunrise). (Flight information from Birds of North America Online)

Inadvertently, the person responsible for my being able to photograph a Saddleback Caterpillar was not mentioned in yesterday’s post. Many thanks to Rick Palumbo for his extraordinary help with this endeavor.

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.


Common Nighthawks Migrating

8-28-14 common nighthawk_w725_h486Nightjars, or “goatsuckers” as some call them, are a family of birds that catch and eat insects on the wing, are often ground nesters, and many (whip-poor-will, for instance) have distinctive calls. Nighthawks are a member of this group, but not a very well-named member, as they are unrelated to hawks and are active at dawn and dusk (not night). This insect-eating bird is often seen on the wing, hawking insects in both rural and urban areas (Fenway Park comes to mind). Its loud, nasal “peent” calls and bat-like flight make this bird very noticeable if it is feeding. We are currently at the peak of the fall Common Nighthawk migration from North to South America. Flocks of hundreds and sometimes thousands are seen flying overhead, often in the early evening.

Unfortunately, in the past 30 years the breeding population of Common Nighthawks in Vermont has declined by 91%, according to the most recent Vermont Breeding Bird Atlas, and this drop in population is not limited to Vermont – much of Canada, New England and beyond has experienced a 50% – 70% decline. Increased predation, indiscriminate use of pesticides leading to lowered insect numbers and habitat loss may have played a part in this drop. (Photo from public domain.)

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.


Least Sandpipers Migrating

7-22-14 least sandpiper IMG_7923Least Sandpipers are the smallest shorebirds in the world, weighing only an ounce and measuring 5 – 6 inches long. Their fall migration has already begun, with individuals leaving their breeding grounds in the subarctic tundra and far northern boreal forest for their wintering grounds in Central and South America. Banding has revealed that the eastern population of Least Sandpipers undertakes nonstop transoceanic migrations of about 1,800 to 2,500 miles from the Gulf of St. Lawrence and New England to northeastern South America. Not much bigger than a sparrow, this common but declining shorebird can be seen refueling on mud flats throughout New England during its fall migration.

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.


Bobolinks Fledging and Preparing to Migrate

7-14-14 bobolinks2  234Between their striking black and white plumage and their long, bubbly song, male Bobolinks are hard to miss if they are inhabiting a field. The female’s plumage is more subtle, with lots of browns so that she blends in well when on her ground nest. The Bobolink’s most notable accomplishment is its annual migration between breeding (northern U.S. and southern Canada) and wintering (northern Argentina, Paraguay, Brazil, Bolivia) grounds — a round-trip distance of approximately 12,500 miles. According to Cornell’s Birds of North America Online, one female Bobolink known to be at least nine years old presumably made this trip annually, which would mean that in her lifetime she flew a distance equal to traveling 4.5 times around the earth at the equator.

Grassland birds such as Bobolinks, Eastern Meadowlarks, Upland Sandpipers and numerous sparrows, which have been in decline for decades, populate New England’s hay fields, meadows, and pastures. Many of these birds build their nests on the ground, raise young, and forage for insects and grains in summer months. If you own or manage a hayfield that hosts Bobolinks (or any other grassland species), consider delaying mowing until after mid- July to allow these birds the opportunity to fledge their young and get them ready for one of the longest migratory flights of any North American songbird. (Photo: male Bobolink on rock, female on grass.) (Thanks to Jeannie Killam and Terry Ross for photo op.)

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.


Waves of Warblers

5-19-14 -A. Redstart 012Birders wait with great anticipation for the waves of warblers that pass through New England in May. Flocks, or waves, often consist of several species, with the males’ plumages presenting a variety of brilliant colors, making the search for these fast-moving, tiny birds well worth the effort. Returning from their wintering grounds in Central and South America, some warblers make non-stop flights covering more than a thousand miles at a time. When they stop to refuel, their search for insects is incessant. As they hunt for insects in the canopy, often amongst flowering trees such as this Red Oak, American Redstart males (pictured) often flash their wings and tail, both of which have brilliant orange feathers on them, startling an insect long enough to give the Redstart a chance to consume it.

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.


Male Rose-breasted Grosbeaks Return

5-7-14 rose-breasted grosbeakIMG_6053Many of the Rose-breasted Grosbeaks that breed in New England are thought to spend the winter in Panama and northern South America. When the time comes in the spring for their nocturnal migration, adult males depart first, flying northward at an average of 49 miles per hour (this rate includes stopovers). Upon arrival, they establish and maintain their two-acre territories primarily through song. When females arrive and one approaches a singing male, he is initially very aggressive and often attacks the female, but if she persists he eventually comes around and wins her over with courtship displays.

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.


Snowy Owls Headed North

4-21-14 flying snowy 046The record number of Snowy Owls that spent the winter in New England are turning up in all sorts of new locations now that they are on their way back to their breeding grounds on the open tundra and stopping to refuel along the way. Although many were young birds, and won’t breed this year, the adult owls will when they reach the Arctic in a few weeks. First, the males perform aerial and ground displays. After mating, the female selects a nest site. In addition to having a sufficient food supply, the site must be snow-free, not subject to flooding, and command a view of its surroundings. The latter is achieved by making their nest on a hummock, or slightly raised surface of bare ground. The female scrapes a shallow depression in the earth with her claws, twirling around to make a form-fitted hollow. No insulating material is added to this depression – no vegetation, no feather lining. Eggs and nestlings are totally dependent upon the mother’s warmth, transmitted via the large, featherless, pink patch of skin on her belly known as an “incubation patch.” The female alone incubates the eggs and broods the young chicks while the male provides food for his entire family.

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.


Follow

Get every new post delivered to your Inbox.

Join 2,888 other followers