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Birds

Recently-hatched Common Loon Chicks Stay Close to Parents

7-1-15   loon and chick  332The first few days of life for Common Loon chicks can be quite precarious. As soon as their down dries, the chicks are quick to leave their nest and enter the water, where they are not as vulnerable as far as land predators are concerned. However, there are dangers there, as well. Young chicks are exceptionally buoyant, and have difficulty maneuvering in the water. Parents must keep a close eye on them, so as to protect them from predators both above and below the water, such as Bald Eagles and Largemouth Bass. For the first two weeks or so parents provide protection for their young by ferrying them around on their backs much of the time. (Note egg tooth still remains on this two-day-old chick.)

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Male Blackburnian Warblers Singing

blackburnian warbler 473Male Blackburnian Warblers are relatively easy to identify by sight. They are the only North American warbler with an orange throat, and their intense orange breeding plumage is unmistakable. However, because they often forage for spiders and insects high in the canopy where they are hidden from sight, Blackburnians are often located by ear. Their singing peaks soon after they arrive on their breeding grounds. To hear the thin, high-pitched song unmated males sing, as well as mated males when they are near the females, go to http://langelliott.com/mary-holland/BLBUWA_5_songs_with_chips_MB.mp3. (Sound recording © Lang Elliott – langelliott.com & miracleofnature.org)

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Young Eagles Preparing to Fledge

6-11-15 eaglet 062For several weeks prior to their first flight from their nest, Bald Eagle nestlings practice flapping their wings to the point of lifting themselves up several inches into the air. This develops their wing muscles, flight coordination and landing ability.

At anywhere from eight to fourteen weeks of age, juvenile Bald Eagles fledge, or leave their nest. According to Birds of North American Online, up to half of young Bald Eagle nest departures are unsuccessful. The young land on the ground and may remain there for weeks before regaining flight ability. More often than not their parents will continue to feed them, but they are much more vulnerable to predation in this situation. Fledglings may continue to use their nest as a feeding platform for several weeks after leaving it, as they gain flight and foraging skills.

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Home Delivery for Barred Owl Nestlings

email- barred owl adult & young with red-backed vole  1051Young Barred Owls are fed by their parents from the day they hatch until late summer/early fall. During their first two weeks, food is delivered by the adult male to the adult female, in a bill-to-bill exchange. The female tears up the prey into swallowable bits and feeds them to her offspring. During this time the female does little hunting, but she begins to capture prey after about two weeks of brooding the young. At about this time, the young begin consuming whole prey on their own (see photo). Female prey deliveries are greatest immediately following sunset and immediately prior to sunrise, while male prey deliveries remain fairly constant throughout the night. (Photo: Barred Owl delivering Red-backed Vole to nestling.) (Thanks to Alfred Balch for photo op.)

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Northern Waterthrushes Singing

northern waterthrush 276If it is not singing, the Northern Waterthrush, a large wood warbler and not a thrush, can be recognized by its bobbing body and wagging tail. However, its loud, ringing song is the most diagnostic characteristic of this species, and allows one to distinguish it from its look-alike relative, the Louisiana Waterthrush. The primary song of the Northern Waterthrush has three parts, which are said to sound like a vigorous, rapid “sweet sweet swee wee wee chew chew chew chew.”

The Northern Waterthrush also has a flight song which is given on its breeding ground, typically in the evening. This song usually starts with loud, sharp, chips of increasing frequency, delivered from the ground or a low perch. The bird then flies upward through and above the canopy, singing snatches of primary song but quicker and longer, framed in a hurried jumble of half-call/half-song notes.

To hear the primary song of the Northern Waterthrush, go to http://langelliott.com/mary-holland/northern_waterthrush_1_NY.mp3. (Sound recording © Lang Elliott – langelliott.com & miracleofnature.org)

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Great Horned Owlets Soon To Fledge

great horned owl 454Great Horned Owls are said to have a wider range of nest sites than any other bird in the Americas. Most commonly they use tree nests of other species, particularly Red-tailed Hawks as well as other hawks, crows, ravens, herons (Great Blue Heron nest pictured), and squirrels.

These month-old young owls have grown rapidly, from a weight of roughly an ounce at birth to about two pounds. They will weigh approximately 2 1/2 pounds when they fledge. By six weeks of age, young Great Horned Owls are climbing out of the nest and perching on nearby branches, and by seven weeks they are taking short flights.

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Cliff Swallows Building Nests

5-19-15 cliff swallow 719You may have heard of “lining” bees – following one honeybee after another, tracking them to their honey-laden hive. Recently I lined Cliff Swallows. My initial observation was of several swallows on a mud flat in the middle of a river, loading their beaks with mud and taking flight, all in the same direction. Knowing that their nests are made of mud pellets (900-1,200 of them), I knew that they must be nesting somewhere in the vicinity. The length of time between their departure from and return to the mud flat was quite short, so I deduced that the distance they were carrying the mud and depositing it couldn’t be too great. After heading off in the direction that the swallows were flying, I eventually discovered the very beginning of a colony of Cliff Swallow nests under the eaves of a nearby barn.

The building of a nest requires not only finding a source of mud, but also ferrying lumps of it (in their beaks) back to the nest site many, many times. Once a source has been found, its location is made known to all members of the colony, and they all make use of it. Cliff Swallows belonging to the same colony not only use the same source of mud, but gather it together as a group, and return to work on their nests all at the same time. They work in roughly half-hour shifts, after which they all take a break and forage for insects for ten minutes or so before resuming work.

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