Grey butcherbird
Species of bird
- 4 min read
- 5 chapters
Related on Lably
Through Australia and Binomial nomenclature
Other birds in the same family include the Australian magpie, the currawongs, woodswallows and other members of the butcherbird genus Cracticus.
Taxonomy
The grey butcherbird was first described by the English ornithologist John Latham in 1801 under the binomial name Lanius torquatus.
Closely related species include the silver-backed butcherbird (Cracticus argenteus) and the black-backed butcherbird (Cracticus mentalis). The silver-backed butcherbird (Cracticus argenteus) from Arnhem Land and northwestern Australia over to Port Hedland, originally described by John Gould in 1841, was later deemed to be a subspecies of the grey butcherbird. Recently, however, it has again been re-described as a separate species. The silver-backed butcherbird has two subspecies C. argenteus argenteus and C. a. colletti. The black-backed butcherbird occurs in Australia on the Cape York Peninsula and in Papua New Guinea and has two subspecies.
Subspecies
The grey butcherbird has three subspecies:
- C. t. torquatus in south-east Australia
- C. t. cinereus is restricted to the island of Tasmania.
- C. t. leucopterus is widespread; its distribution stretches from the west to the east coast of Australia.
Sign in to keep reading
4 more chapters are free with a Lably account.
Description
The grey butcherbird is a small grey, black and white bird with a weight of 90 grams (3.2 ounces), a body length between 27 and 30 cm (11 and 12 in) and a wing span expanding 37–43 cm (15–17 in). The grey butcherbird is smaller than the Pied Butcherbird (Cracticus nigrogularis).
The adult grey butcherbird has a black head, top and sides; and a white chin and throat through to the lower hindneck. The upperbody is mostly dark grey with streaks of narrow white bands that extends across the uppertail-coverts at the base of the tail. The uppertail is black with narrow white tips. The wings are grey with large areas of white and the underside of the wing is also white. The tip of the beak has a slight downwards hook.
Both the male and female grey butcherbirds are similar in appearance, but the female is slightly smaller in size.
The juvenile is slightly different from the adult, as the juvenile does not have a black head, instead the head is a dark brown with fine streaks on the forehead and ear-covers and white loral spots that meet the eyes and bill, as well as having an off-white chin and throat. The upperbody is dark brown with streaks, and the uppertail-coverts are also a dark brown and have a brownish colour at the base of the uppertail. Juvenile's beaks are completely dark grey and often the hook at the tip of the beak is not obvious. The juvenile grey butcherbird is commonly mistaken for a small kingfisher.
Song
All members of the territorial group contribute to the territorial song, a loud and rollicking song with both musical and harsh elements. The song can be sung by only one member, but more often it is sung in duet or as a group. Some duets are antiphonal where it is not obvious that two or more birds are singing. Most songs are sung with more than one phase and are sung antiphonally. These songs consist of different group members singing different phases sequentially, but sometimes there are some overlap. Some songs have been known to last up to 15 minutes. During this time, there is no vocal interaction with groups from other territories.
Breeding and habitat
The grey butcherbird usually breed in single territorial pairs from July to January. Both sexes defend their territories and nest throughout the year. The female incubates the eggs while the nestlings and fledglings are fed by both parents. The nest is a shallow, bowl-shaped made from sticks and twigs. The nest is lined with grasses and other soft fibres. Nests are normally located within 10 m (33 ft) off the ground.
The grey butcherbird is found in a range of habitats, from eucalypt forests and woodlands, mallee and acacia shrublands, rainforests and riparian vegetation to urban areas and residential townships. The denser forests tend to be the favour for inland areas.
Behaviour and diet
Grey butcherbirds feed on invertebrates, mainly insects; small vertebrates, including other small birds and their nestlings and lizards; and occasionally fruit and small seeds. They have a tendency to catch more food than they need and have a habit to store food in the fork of a branch to be consumed later. Uneaten food and over-sized food may also be impaled or stored for later.
Grey butcherbirds sit in branches and wait for prey. Prey is captured by the grey butcherbird sally-pouncing the prey on the ground. Small birds and insects can be captured in flight by using sally-striking. The grey butcherbird ambushes the foraging birds while they are on the ground, usually approaching and attacking them from behind. The grey butcherbird either feeds alone, in pairs or in small family groups.