Charadrius vociferus
killdeer

Killdeer are native to the Nearctic and Neotropical regions. They can be found over much of North America and in parts of South America. From the Gulf of Alaska coastline the range extends southward throughout the United States and reaches the Atlantic and Pacific coasts. Distribution continues through the Nearctic zone and into South America, runs along the Andes Mountain Range and terminates at the southern border of Peru. (Hayman, Marchant, and Tony, 1986)

Killdeer live in terrestrial biomes including savannas, taiga and deciduous forest regions, preferring open areas within these biomes, especially sandbars, mudflats and pastures. Their preferred topographical features range greatly (shorelines, savannas, high altitude regions), with temperature being the critical factor of environment choice. With its large year-round distribution range (and as a result, a small wintering range), C. vociferus remain within their habitats year-round, migrating only when temperature becomes extremely cold, which for the killdeer, is approximately 10 degrees Celsius and below. Killdeer are highly adaptive to climate and environmental variations, and as a consequence, have effectively settled into human altered environments including parks and agricultural zones. (Hayman, Marchant, and Tony, 1986; Root, 1988)

Adult killdeer reach a length ranging between 23-27cm, with an average wingspan of 17.5 cm. Distinguishing characteristics include a dark, double-banded breast, with the top band completely encircling the upper body/breast. Another band is located at the head, resembling a mask absent of the facial portion. The band is continuous, thinning while going across the face along the forehead region and above the bill, and thickening at the supercilium; extending around the eye and onward around the back of the head. Plumage is relatively absent of complexity with the exception of a vividly colored, reddish-orange rump that is visible during flight and behavioral displays. The rest the body consists of a grayish-brown coloration along the dorsal side, crown and nape, while the ventral region is white. Characteristic of species in the same order, C. vociferus possess a lengthened tarsus and a pointed, extended bill, suitable for its foraging habits.

Male and female killdeer are similar in appearance, though breeding females may have additional brown on their face. Juvenile killdeer are similar in appearance to adults, with the exception of buffed fringes and the (uncommon) presence of tail-down.

There are three recognized subspecies of Charadrius vociferus. These subspecies are differentiated on the basis of differences in coloration and pattern of rufous edgings on their back and wing coverts. ("National Geographic Society. Field Guide to the Birds of North America", 1987; Hayman, Marchant, and Tony, 1986; Jackson and Jackson, 2000)

The oldest known wild killdeer lived at least 10 years and 11 months. (Jackson and Jackson, 2000)

Killdeer are usually solitary or in breeding pairs, though they occasionally gather in a loose flock during non-breeding periods. They are easily heard throughout their habitat due to their extremely loud, piercing call, mimicking the expression "kill-dee(r)," (the origin of their common name).

Killdeer are largely non-migratory, though they do migrate south when temperatures drop below 10 degreed Celsius. Killdeer are active during the day and at night. ("National Geographic Society. Field Guide to the Birds of North America", 1987; "New Hampshire Public Television", 2000; Hayman, Marchant, and Tony, 1986; Jackson and Jackson, 2000)

Home Range

Average home ranges during the breeding season ranged from 0.23 to 0.68 ha in two studies. (Jackson and Jackson, 2000)

Killdeer communicate using vocalizations and physical displays. Their common name comes from the loud, piercing "kill-dee(r)" call. Killdeer calls often serve as an alert system for other individuals, including animals of different species. (Jackson and Jackson, 2000)

Charadrius vociferus can be considered omnivorous since berries are known to be included within the diet. Primarily though, the diet consists of various aquatic and terrestrial invertebrates, insects and crustaceans. ("The Encyclopedia of Birds", 1985)

Killdeer adults, chicks and eggs are vulnerable to predation by a wide assortment of predators. These include birds of prey, gulls, crows and ravenssnakes, foxes, coyotes, domestic cats, domestic dogs, raccoons, skunks and Virginia opossums.

Killdeers typically try to draw predators that come near the nest by distracting them. An adult killdeer sitting on eggs will lie still during the approach of an intruder. When the intruder comes too near, the adult will leave the nest and perform an "injured bird" routine, hobbling away and dragging its wings. After drawing the unwelcome visitor far enough from the nest, the adult killdeer takes off in flight and eludes the potential danger. ("National Geographic Society. Field Guide to the Birds of North America", 1987; "New Hampshire Public Television", 2000; Hayman, Marchant, and Tony, 1986)

Killdeer affect the populations of the insects and crustaceans they eat. They also provide a valuable source of food for their predators. Killdeer also host at least 13 different species of parasites. (Jackson and Jackson, 2000)

There are no known adverse effects of killdeer on humans.

Any economic/agricultural contribution from killdeer is most likely the result of their ability to control crop pests. Since insects comprise a large majority of the their diet, killdeer eat pests such as mosquitoes, ticks, and locusts. ("The Encyclopedia of Birds", 1985)

Killdeer are neither endangered nor threatened according any of the organizations involved with biodiversity and conservation. They are, however, protected under the U.S. Migratory Bird Act.

Killdeer are highly adaptable and able to thrive in many human-altered habitats. Because of this, they are a very common species, with an estimated worldwide population of 1,000,000 individuals.