Shrikes are passerine birds of the family Laniidae. The family is composed of thirty-one species in three genera. The family name, and that of the largest genus, Lanius, is derived from the Latin word for "butcher", and some shrikes are also known as "butcher birds" because of their feeding habits. They are fairly closely related to the bush-shrike family Malaconotidae.
Distribution, migration and habitat
Most shrike species have a Eurasian and African distribution, with just two breeding in North America (the loggerhead and great grey shrikes). There are no members of this family in South America or Australia, although one species reaches New Guinea. The shrikes vary in the extent of their ranges, with some species like the great grey shrike ranging across the northern hemisphere to the Newton's fiscal which is restricted to the island of São Tomé.
They inhabit open habitats, especially steppe and savannah. A few species of shrike are forest dwellers, seldom occurring in open habitats. Some species breed in northern latitudes during the summer, then migrate to warmer climes for the winter.
Description
Shrikes are medium-sized birds, up to 50 centimetres (20Â in) in length, with grey, brown, or black and white plumage. Their beaks are hooked, like that of a bird of prey, reflecting their predatory nature, and their calls are strident.
Behaviour
Shrikes are known for their habit of catching insects and small vertebrates and impaling their bodies on thorns, the spikes on barbed-wire fences or any available sharp point. This helps them to tear the flesh into smaller, more conveniently-sized fragments, and serves as a cache so that the shrike can return to the uneaten portions at a later time. This same behavior of impaling insects serves as an adaptation to eating the toxic lubber grasshopper, Romalea guttata. The bird waits for 1â€"2 days for the toxins within the grasshopper to degrade, and then can eat it.
Shrikes are territorial, and these territories are defended from other pairs. In migratory species a breeding territory is defended in the breeding grounds and a smaller feeding territory is established during migration and in the wintering grounds. Where several species of shrike exist together competition for territories can be intense.
Shrikes make regular use of exposed perch sites, where they adopt a conspicuous upright stance. These sites are used in order to watch for prey items and to advertise their presence to rivals.
Breeding
The shrikes are generally monogamous breeders, although polygyny has been recorded in some species. Co-operative breeding, where younger birds help their parents raise the next generation of young, has been recorded in both species in the genera Eurocephalus and Corvinella as well as one species of Lanius. Males attract females to their territory with well stocked caches, which may include inedible but brightly coloured items. During courtship the male will perform a ritualised dance which includes actions that mimic the skewering of prey on thorns and will feed the female. Shrikes make simple, cup-shaped nests from twigs and grasses, in bushes and the lower branches of trees.
Species in taxonomic order
FAMILY: LANIIDAE
- Genus: Lanius
- Tiger shrike, Lanius tigrinus
- Bull-headed shrike, Lanius bucephalus
- Red-backed shrike Lanius collurio
- Isabelline shrike Lanius isabellinus
- Red-tailed shrike Lanius phoenicuroides
- Brown shrike, Lanius cristatus
- Burmese shrike, Lanius collurioides
- Emin's shrike, Lanius gubernator
- Souza's shrike, Lanius souzae
- Bay-backed shrike, Lanius vittatus
- Long-tailed shrike Lanius schach
- Grey-backed shrike Lanius tephronotus
- Mountain shrike or Grey-capped shrike, Lanius validirostris
- Lesser grey shrike Lanius minor
- Loggerhead shrike, Lanius ludovicianus
- Great grey shrike or Northern shrike Lanius excubitor
- Southern grey shrike Lanius meridionalis
- Chinese grey shrike, Lanius sphenocercus
- Grey-backed fiscal, Lanius excubitoroides
- Long-tailed fiscal, Lanius cabanisi
- Taita fiscal, Lanius dorsalis
- Somali fiscal, Lanius somalicus
- Mackinnon's shrike, Lanius mackinnoni
- Southern fiscal, Lanius collaris
- Uhehe fiscal, Lanius collaris marwitzi
- São Tomé fiscal, Lanius newtoni
- Woodchat shrike, Lanius senator
- Masked shrike, Lanius nubicus
- Genus: Corvinella
- Yellow-billed shrike, Corvinella corvina
- Genus: Urolestes
- Magpie shrike, Urolestes melanoleucus
- Genus: Eurocephalus
- Northern white-crowned shrike, Eurocephalus rueppelli
- Southern white-crowned shrike, Eurocephalus anguitimens
Birds with similar names
Other species, popularly called "shrikes", are in the families:
- Prionopidae, helmetshrikes.
- Malaconotidae, puffback shrikes, bush shrikes, tchagras and boubous.
- Campephagidae, Cuckoo-shrikes.
The Prionopidae and Malaconotidae are quite closely related to the Laniidae, and were formerly included in the shrike family. The cuckoo-shrikes are not closely related to the true shrikes.
The Australasian butcherbirds are not shrikes, although they occupy a similar ecological niche.
References
External links
- Shrike videos on the Internet Bird Collection
