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Nature Reflections - February 9, 2006
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The American Crow by Jean Griffin Is there anyone in Eastern Canada (or in fact most of
In
these winter roosts they may number in the thousands from which they
spread out daily to find food. In late afternoon they will fly as much
as 80 km as they begin returning to the roost sites, where the large
numbers provide a sort of protection from predators such as Great
Horned Owls, Red-tailed Hawks, or Raccoons, not to mention man. Now
when February gives way to March, I expect to see first one pair then
another as they return to their breeding grounds of the previous year. Often
described as one of the most intelligent of birds, it is reported they
have the largest brains in relation to their size as compared to all
other birds. This gives them the ability to adapt to a variety of
habitats. The fact that they will eat almost anything that does not eat
them first means they can find food almost anywhere. Once, and often
still, considered vermin and only worthy of destruction because of a
tendency to devour crops, they are also beneficial by destroying large
numbers of plant-eating insects. Also known for nest plundering of
smaller birds, is it possible that by so doing they weed out the weak
and feeble? During courtship, on the ground, a male will face the female, fluff his feathers, spread his
tail and bow repeatedly while uttering a rattling call. After mating
they will perch together and touch bills and preen each other’s
feathers. Since they mate for life, most of this is not seen in a pair
returning to their breeding ground. They like to nest alone, though if
suitable nesting locations are scarce, several pairs may nest close to
one another. The nest, often high in a tree (where the term ‘crow’s
nest’ is derived) will contain four to six eggs, and both parents will
share duties. Young of the previous year may help care for the young,
which are born blind and naked. Wary
and suspicious of humans, while a flock feeds on the ground there will
always be one or two in the trees as lookouts. The habit of proclaiming
‘danger’ also warns other birds and animals. If one crow sees a
predator such as an owl or a hawk, it will give an assembly call, which
quickly brings every crow within earshot to the source. The resultant
behaviour, called “mobbing”, will have them diving repeatedly at the
predator, and if they succeed in forcing it to fly away, they will
chase it until out of that territory. An injured crow may give a
distress call, bringing other crows to its defense. The
English language uses various expressions probably based on assumptions
(right or wrong) about the crow. “To eat crow” means to be forced to
admit one’s mistake. To “crow” is to brag obnoxiously. Wrinkles around
the eyes are called “crow’s-feet”. A flock of crows is known as a
“murder” of crows or a “crow bar”. Observations: On January 24 Steve Blight saw a Bald Eagle near the junction of
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