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Posts tagged “Quiscalus quiscula

Common Grackles Nest-building

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Common Grackles are hard to miss and hard to mistake for any other bird, with their yellow eyes, iridescent bronze or purple plumage and long, keel-shaped tails. Most of the spring migrants have reached their breeding grounds, and courtship, mating and nest-building are underway.

Because grackles begin reproduction so early in the season, conifers are the nesting site of choice due to the cover they provide. Females tend to choose the actual site for a nest, and in so doing can be quite fickle, often abandoning partially constructed nests and selecting alternative sites. They earn this right, as they’re usually doing all the construction work, although males have been observed with nesting materials, helping to build and repair nests.

Look for their 6-8”-diameter, large bulky nests near water, agricultural fields or near human habitation. They are usually built four to twenty feet above the ground. If you find a bird on the nest, it will most likely be an incubating female (slightly less glossy than male) – males not only do not have a brood patch and do not participate in incubating the eggs or brooding the young, but roughly half of the males desert their mates during this time. Those that do remain participate in the feeding of their young nestlings.

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Nestling or Fledgling?

6-7-16  grackle fledgling 057We are at the time of year where finding a young bird on the ground is not unusual, and many well-meaning people assume that if a bird can’t fly, it has been abandoned by its parents.  While some of these birds may be young that have fallen out of their nest, the fledglings of many species spend as many as two to five days on the ground before they can fly any distance.  While they are on the ground, the birds are cared for and protected by their parents and are taught vital life skills (finding food, identifying predators, flying).  To deprive such a fledgling of this developmental stage by removing it from its parents is to lessen its chances of survival, so it’s behooves us to be able to tell whether or not a young bird belongs out of the nest or not.

If the young bird is nearly naked or covered with down, not quill feathers, or its eyes haven’t opened, it is obviously a nestling.  If you can’t find its nest, a berry basket in the vicinity of where you found it, suspended from a branch, is a good facsimile.  Birds have a poor sense of smell and very strong parental instincts and more often than not continue to care for their young after a disturbance, although it may be a few hours before they do so.  If, after several hours, there is no sign of a parent, a local museum or nature center should be able to direct you to a nearby wildlife rehabilitator.

Fledgling birds, birds that have voluntarily left their nest, are usually fully feathered and have a very short (one inch or so) tail.  They are able to walk, hop and flap, and they may attempt short flights.  You may not see them, but a parent or two is nearby, keeping an eye on them, feeding them and teaching them how to survive on their own (see insert).   These are the birds that humans often mistakenly “rescue.”  If you find a fledgling, it should be left alone or, at the most, placed in a nearby shrub. If possible, keep people and pets away so the parents will continue to care for it until it can fly. (Photos:  fledgling and attending adult Common Grackle)

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Mixed Emotions Greet Returning Common Grackles

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The first common grackles of the year have been sighted — not something to be celebrated by all, for there is a lot to dislike about common grackles. They are among the most significant agricultural pest species in North America, causing millions of dollars in damage to sprouting corn. They also eat other birds’ eggs and nestlings, and occasionally kill and consume adult birds. However, one has to admire the intelligence that some of these actions plus others reflect.

These members of the icterid, or blackbird, family have learned to follow plows in order to consume the invertebrates and mice that are exposed. Grackles engage in “anting” – letting ants crawl all over their bodies in order for the ants to secrete formic acid which may then rid the grackles of parasites. They rotate acorns between their mandibles, utilizing a ridge inside their mouths to open the acorns. And at least one common grackle was crafty enough to live for 23 years before being killed by a bird of prey – an extraordinarily long life for a passerine, or perching, bird.

Regardless of how we regard any one species, the phenomenon of spring migration and the remarkable birds that survive its rigors every year are cause for celebration.

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Common Grackles Returning

3-30-15 common grackle 083Male Common Grackles have started to arrive on their northeastern breeding grounds (females will arrive in another week or so), having migrated from southern U.S. Common Grackles typically migrate in large flocks containing hundreds of birds, not all grackles. Red-winged Blackbirds, Brown-headed Cowbirds, European Starlings and occasionally American Robins can be found alongside Common Grackles in these migrating flocks. In the early 1990’s, magnetic material was found in the heads and necks of Common Grackles, indicating that the geomagnetic field may play a role in their migratory navigation.

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Common Grackle Threat Display

5-3-13 common grackle DA8A1629Although the common grackle, a member of the blackbird family, is the bane of many corn growers as well as a threat to songbirds trying to raise young (grackles eat other birds’ eggs and nestlings), it is quite a colorful bird, with its pale yellow eyes and iridescent purple plumage. Grackles have already begun nesting and defending their territory, as can be seen from the stance of the bird in this image. This “bill-up display” is a position assumed when a male is being approached on its territory by another male. It moves its head upwards so that its bill is almost vertical, signaling to the approaching grackle that it would be in its best interest to depart.