Loggerhead Shrikes inhabit open country with short vegetation and well-spaced shrubs or low trees, particularly those with spines or thorns. They frequent agricultural fields, pastures, old orchards, riparian areas, desert scrublands, savannas, prairies, golf courses, and cemeteries. Loggerhead Shrikes are often seen along mowed roadsides with access to fence lines and utility poles. Back to top
Loggerhead Shrikes eat insects and other arthropods, amphibians, reptiles, small mammals, and birds; they also sometimes feed on roadkill and carrion. Their staple foods include agricultural pests such as grasshoppers, beetles and rodents. Insects generally dominate the Loggerhead Shrike’s diet during breeding season, while winter brings a greater reliance on vertebrate prey. These include lizards, snakes, frogs, turtles, sparrows, goldfinches, ground squirrels, voles, mice, and shrews, to name just a few.Back to top
Both sexes help find the nest site, inspecting many locations before choosing. Loggerhead Shrikes often build their nests in thorny vegetation, which may help keep predators away. In the absence of trees or shrubs, they sometimes nest in brush piles or tumbleweeds. Average height of nests above the ground ranges from about 2.5–4 feet.
Both sexes gather material. The female usually constructs the nest on her own, over a period of about 6–11 days. The bulky, well-insulated open cup is neatly woven of rootlets, twigs, forbs, and bark strips and lined inside with soft material such as flowers, lichen, grass, moss, feathers, fur, string, or cloth. The nest is about 6 inches in diameter on the outside, with an interior diameter of about 4 inches; the cup is about 3 inches deep.
|Clutch Size:||5-6 eggs|
|Number of Broods:||1-2 broods|
|Egg Length:||0.9-1.1 in (2.3-2.7 cm)|
|Egg Width:||0.7-0.8 in (1.8-2 cm)|
|Incubation Period:||15-17 days|
|Nestling Period:||16-20 days|
|Egg Description:||Eggs are grayish buff, marked with gray to yellowish-brown.|
|Condition at Hatching:||Naked, blind, and helpless, with closed eyes.|
Loggerhead Shrikes hunt by scanning the ground from elevated perches, then diving onto prey. They also hover-hunt. Loggerhead Shrikes sometimes hunt from the ground, flashing their wing patches in a manner similar to the Northern Mockingbird, to startle prey out of hiding. To immobilize large prey items, the Loggerhead Shrike impales them on sharp objects such as thorns and barbed wire, or tucks them into forks between branches. Caches of prey thus lain away, also called “larders” or “pantries,” provide food stores during winter when prey is scarce, or in breeding season when energy demands are high. A well-provisioned larder may also help a male shrike attract a mate. Loggerhead Shrikes maintain territories largely through songs and displays. Males challenge intruders with a wing-fluttering bow, like an intensified version of their prey-stalking display. Displaying rivals usually face away from one another, but may whirl to face each other or stamp the ground. Before nesting, several neighboring shrikes may gather together and call or display for several minutes. This may help establish territories in the neighborhood, promote pair formation, and help new arrivals find territories near already-established birds. Courting males feed and sing to females, perform a ritual dance, and/or perform a flight display. They are mostly monogamous, although females occasionally raise one brood with one male and then take up with another mate for a second brood the same season.Back to top
Loggerhead Shrikes are still fairly numerous in some areas (particularly in the southern and western U.S.) but their populations have fallen sharply, and they have practically disappeared from the northeastern U.S. Between 1966 and 2019, the species declined by nearly 2.6% per year, resulting in a cumulative decline of approximately 75%, according to the North American Breeding Bird Survey. Partners in Flight estimates the global breeding population at 7 million and rates them 11 out of 20 on the Continental Concern Score, indicating a species of relatively low conservation concern. However, they are included on the list of Common Birds in Steep Decline for species that are still too numerous or widely distributed to warrant Watch-List status but have been experiencing troubling long-term declines. The species’ decline coincides with the introduction and increased use of chemical pesticides between the 1940s and the 1970s and may result in part from the birds’ ingestion of pesticide-laced prey from treated fields. Other likely causes of population decline include collision with vehicles, urban development, conversion of hayfields and pastureland, decimation of hedgerows, habitat destruction by surface-coal strip-mining, and altering of prey populations by livestock grazing. Given this bird’s potentially high reproductive rate, and provided that adequate habitat continues to be available, Loggerhead Shrike populations may be able to recover if the causes of the bird’s decline can be identified and eliminated.Back to top
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