Cooper's Hawk
Unlike
larger raptors that spiral lazily above Oklahoma's wide-open
spaces, the Cooper's hawk (Accipiter cooperii) keeps a low
profile in woodland edges and thickets. Along with its
preference for thick cover, this species' swift flight and
rather non-descript markings make sighting and identifying this
diminutive bird of prey a bit difficult. Those fortunate enough
to see a Cooper's hawk are quickly taken with its low-key
elegance and understated displays of power.
Also known as the "blue darter", the Cooper's hawk is about the
same size as a crow. Its distinguishing characteristics include
a large head, long tail and short, rounded wings. Its back is
slate gray, and its cream-colored underside is rippled with
rust-colored bars. The tail is striped on top with brown and
gray, and underneath with gray and cream. Perhaps this bird's
most identifiable marking is its white-tipped tail feathers.
Females are larger than males, but adults of both sexes are
known for their ruby red eyes.
In flight, the Cooper's hawk resembles the closely related
sharp-shinned hawk. Both fly straight and fast, and their flight
pattern is characterized by strong wing strokes and short
glides.
Unlike the Cooper's hawk, however, the tail of the sharp-shinned
hawk is shorter
and more squared at the very end, and it also has a black tip.
The Cooper's hawk's longer tail gives it great agility for
hunting small birds and mammals in the restricted confines of
its woodland home. This environment requires quick braking,
tight turns and quick climbs, and the Cooper's hawk is perfectly
designed for such deft maneuvering.
When hunting, the Cooper's hawk usually flies within a few feet
of the ground and swiftly pounces on unsuspecting prey. Although
it uses this method mainly for catching birds, this species also
eats snakes, lizards, frogs and insects. One individual was even
documented eating minnows while perched near a shallow pool.
Though uncommon throughout its range, the Cooper's hawk can be
found in Oklahoma year-round, especially in eastern wooded
areas. It is migratory, and the possibility of seeing one
increases during the winter. This species' breeding range covers
the entire state, so it's also possible to observe nesting
activity.
A Cooper's hawk will nest once a year between mid-April and
mid-June. The male locates possible nest sites and start
building in hopes of attracting a female. Even though a mated
pair may use the same breeding territory year after year, they
usually build a new nest each season. Their nest consists of a
stick platform, between one- to three-feet wide, built close to
the trunk of a tree in the lap several main limbs. Nests are
usually 20 feet or more off the ground. The female usually lays
a single clutch of four to five greenish-white eggs. Both
parents attend to the eggs for the 24-day incubation period.
Often hatching on alternate days, the fledglings can immediately
see and take scraps of food from their parents. The immature
Cooper's hawks will leave the nest 26 days later, looking much
like their parents except with golden eyes, mottled breasts and
white bellies. They will mature in two to three years and may
live for 10 to 15 years.
Because of its speed on the wing and comparatively dull
appearance, most experienced birders are satisfied simply to
marvel at this bird's power and agility. In keeping with the
refined presence of this woodland raptor, that's exactly as it
should be.
Next time you're in the woods and you see a shadow sail silently
through the trees, it's not your imagination. It's just a
Cooper's Hawk on the prowl.