“Little sparrowhawk”的意思、由来-开放百科全书

The little sparrowhawk (Accipiter minullus) is a species of Afrotropical bird of prey in the family Accipitridae. It is the smallest member of the genus Accipiter and forms a superspecies with the red-thighed sparrowhawk (Accipiter erythropus).

Description

The little sparrowhawk is, as its name suggests a very small bird of prey which is also distinguished by two white spots on the underside of its central tail feathers and by a narrow white patch on the lower rump. It is sexually dimorphic and the male has dark grey upperparts, which can appear almost black, this colour extending on to the cheeks to contrast with the white throat. The underparts are white barred with fine rufous bars. The females are overall browner on the upperparts and the underpart bars are also browner and less fine than the male. The juveniles are browner overall with pale tips to the upperpart feathers and is spotted with grown below rather than barred and the rump feathers have only the tips white, and shows dark. In adults the bill is black, the long legs and long toes are yellow, the cere is yellow and the eyes are deep yellow; in juveniles have a yellowish-green cere and brown eyes. The length is {{convert|23|–|27|cm|in|abbr=on}}; the wingspan is {{convert|39|–|50|cm|in|abbr=on}}, the male weighs {{convert|74|-|85|g|abbr=on}} and the female {{convert|68|-|105|g|abbr=on}}.^[4]

Distribution and habitat

The little sparrowhawk occurs in eastern and southern sub-Saharan Africa from Ethiopia south to the southern Democratic Republic of Congo and northern Angola, south as far as the eastern Western Cape in South Africa.^[5]

The little sparrowhawk is a woodland bird which can be found in patches of woodland and scrub, typically along river valleys.^[4] In drier areas it can be found in open areas such as fynbos and grassland, also in suburban gardens.^[5]

Behaviour

Breeding

The little sparrowhawk is a monogamous and territorial solitary nester. The male's display sees him perch with his body held parallel to the perch the sways his head from side to side. The female takes most of the responsibility of building the nest constructing a small stick platform which has a thin lining of green leaves. She typically places the nest in the main fork of a tree, favouring alien species, such as Eucalyptus, poplars, jacaranda and weeping willow. She will use old nest of a shikra or gabar goshawk rather than building her own nest.^[5]

In southern Africa the one to three eggs are laid from September to December, with a peak in October. The eggs are incubated by both the male and the female for about 31–32 days, although the female will perform at least three quarters of the incubation. The male regularly brings food to the incubating female and he continues to do so as she takes responsibility for the brooding of the chicks, The male also defends the nest from any other birds which approach it and vigorously chases them away, very vigorously if the intruding bird is another bird of prey. The young fledge at about 25–27 days old, remaining on their parents' territory for up to a year.^[5] In other parts of Africa breeding has been recorded from March to April in north-eastern Africa and from October to November in western Kenya.^[4]

Food

The little sparrowhawk is a bird hunter, waiting in cover the pursuing prey in a short dash and capturing it in flight.^[4] The main prey is small birds up to the size of a thrush or a dove. Bats may also be caught and some prey is taken from the ground, including frogs, lizards and rodents. Larger insects and termites are also taken.^[5]

Predation

The recorded predators of adult little sparrowhawks include the gabar goshawk (Micronisus gabar), while chicks have sometimes been predated by lizard buzzards (Kaupifalco monogrammicus).^[5]

Taxonomic notes

The little sparrowhawk forms a superspecies with the red-thighed sparrowhawk (Accipiter erythropus) and both species are part of the potential genus Tachyspiza which if Accipiter is accepted as paraphyletic is the name of the proposed genus for most of the species currently placed in Accipiter sensu lato.^[6]

References

1. ^{{cite web | url = http://www.iucnredlist.org/details/22695581/0IUCN|id=22695581 |title= Accipiter minullus (Little Sparrowhawk) | accessdate = 24 October 2016 | publisher = International Union for Conservation of Nature and Natural Resources|work = The IUCN red List of Threatened Species}}
2. ^{{cite web | url = http://avibase.bsc-eoc.org/species.jsp?avibaseid=CE1CF6FD20908CDB | title = Little Sparrowhawk Accipiter minullus (Daudin, 1800) | accessdate = 24 October 2016 | publisher = Deni Lepage| work = Avibase}}
3. ^{{cite web | url = http://gni.globalnames.org/data_sources/30?page=9&search_term=ns%3AACC* | title = Repository "Index to Organism Names" | accessdate = 24 October 2016 | publisher = GBIF and EOL}}
4. ^¹²³{{cite web | url = http://www.arkive.org/little-sparrowhawk/accipiter-minullus/ | title = Little sparrowhawk (Accipiter minullus) | accessdate = 24 October 2016 | publisher = Wildscreen | archive-url = https://web.archive.org/web/20161117132504/http://www.arkive.org/little-sparrowhawk/accipiter-minullus/ | archive-date = 2016-11-17 | dead-url = yes | df = }}
5. ^¹²³⁴⁵{{cite web | url = http://www.biodiversityexplorer.org/birds/accipitridae/accipiter_minullus.htm | title = Little Sparrowhawk Accipiter minutus | accessdate = 24 October 2016 | publisher = Iziko Museums of South Africa}}
6. ^{{cite web | url = http://worldbirdinfo.net/index.php/family/category_bird_list/QUNDSVBJVFJJREFFLFRhY2h5cGl6aW5hZTpUYWNoeXNwaXphIEhhd2tz/NewFamilyName | title = World Bird Info | accessdate = 24 October 2016 | publisher = World Bird Info}}