Test your knowledge of Harris's Hawk natural history...
Take the Harris's Hawk challenge!
Which mating system(s) are documented for Harris's Hawks breeding in North America?
monogamy (only the mated pair)
polyandry (1 female copulating with 2 males)
polygyny (2 females copulating with 1 male and sharing a nest)
all of the above
Which of the following are common prey of the Harris's Hawk in North America?
woodrats (pack rats), cottontails, cactus wrens and quail
woodrats (pack rats), snakes, bats and cactus wrens
cottontails (pack rats), snakes, spade-footed toads
None of the above.
Predators documented raiding Harris's Hawk nests include:
American alligator, diamond-backed rattlesnake, and raccoon
Raccoon, coyote and Ferruginous Pygmy-Owl
Raccoon, raven, and Great Horned Owl
What are known, human-caused sources of mortality?
Electrocution, drowning in stock tanks, baits and traps set for coyotes
DDT from food sources amplified up the food chain
Wind turbine collisions
All of the above.
What is the clutch size for Harris's Hawk?
Ususlly lays only 1 egg but occasionally lays up to 3 eggs.
Usually lays 2 to 4 eggs with a range of 1 to 7 eggs.
Almost always lays 3 eggs, but usually only 2 hatch.
None of the above.
The dominance hierarchy in Harris's Hawk society is such that:
adults dominate juveniles, and within an age class, males dominate females.
juveniles dominate adults, and within an age class, females dominate males.
adults dominate juveniles, and within an age class, females dominate males.
females dominate males and within a sex class, adults dominate juveniles.
In North America, Harris's Hawks primarily live in which habitat types?
Swamps, marshes, and bottomland hardwood forests
Sonoran desert, various mixed-scrub deserts and mesquite-dominated brushlands
Mountains above 1000 feet in elevation and Pinyon pine forests
All of the above.
What does the specific epitaph "unicinctus" mean?
United in a group.
Which raptor is the Harris's Hawk's closest living relative?
Common Black Hawk
How many years does it take for the southern subspecies to achieve adult plumage?
One year; the same as the northern subspecies.
Four to five years.
What are notable differences between the sexes?
Males have a brigther, more colorful plumage.
Males are smaller in size and have a lighter build.
Trick question: males cannnot be distinguished from females without DNA testing.
Which statement best describes the reproductive strategy of the Harris's Hawk?
Nest once to multiple times in high prey years and forgo breeding in low prey years.
Nest once annually like most mid-sized to large raptors.
Nest multiple times each year because young are unlikely to survive in arid conditions.
When Harris's Hawks breed cooperatively, the extra adult is most likely to be:
A female retained from the most recent nesting attempt.
Any female, whether she is recruited or is an offspring.
An adult male.
The most likely reason that Harris's Hawks are not native to the northern U.S. and Canada is:
The Rocky Mountains are a barrier to dispersal.
Short distance dispersal.
Adaptations to heat tolerance resulted in cold sensitivity.
The behavior unique to Harris's Hawks that is known as "back-standing" or "stacking" is:
a way for group members to share a good hunting perch.
a precursor to copulation.
strickly a dominance behavior where the winner perches on top.
The subspecies of Harris's Hawks currently recognized by science are:
Parabuteo unicinctus superior, P. u. harrisi, and P. u. unicinctus
Parabuteo unicinctus superior, P. u. harrisi, P. u. unicinctus, and P. u. leucorrhous
Parabuteo unicinctus harrisi and P. u. unicinctus
Which of the following behaviors are documented for group hunting in Harris's Hawk?
All of the above
Another common name for the Harris's Hawk is:
When a Harris's Hawk is injured and cannot participate in the hunt, its group members may bring food to it.
The species' adaptations for living in hot climates include:
a thick undercoat coat of down in adults.
bay-colored upper wings (shoulders).
a mostly bare face, a thin coat of down, and relatively short abdominal feathers for a buteonine hawk.
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