Lord Howe silvereye

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Lord Howe silvereye
Lord Howe Silvereye.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Zosteropidae
Genus: Zosterops
Species: Z. lateralis
Subspecies:Z. l. tephropleurus
Trinomial name
Zosterops lateralis tephropleurus
Gould, 1855
Synonyms
  • Zosterops tephropleura
  • Zosterops tephropleurus

The Lord Howe silvereye (Zosterops lateralis tephropleurus), also known as the Lord Howe white-eye, Lord Howe Island white-eye or, locally, as the "Little Grinnell", is a small bird in the white-eye family, Zosteropidae. It is a subspecies of the silvereye ( Zosterops lateralis ), though sometimes considered a full species. It is endemic to Lord Howe Island in the Tasman Sea, part of New South Wales, Australia.

White-eye family of birds

The white-eyes are small passerine birds native to tropical, subtropical and temperate Sub-Saharan Africa, southern and eastern Asia, and Australasia. White-eyes inhabit most tropical islands in the Indian Ocean, the western Pacific Ocean, and the Gulf of Guinea. Discounting some widespread members of the genus Zosterops, most species are endemic to single islands or archipelagos. The silvereye, Zosterops lateralis, naturally colonised New Zealand, where it is known as the "wax-eye" or tauhou ("stranger"), from 1855. The silvereye has also been introduced to the Society Islands in French Polynesia, while the Japanese white-eye has been introduced to Hawaii.

Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".

Subspecies taxonomic rank subordinate to species

In biological classification, the term subspecies refers to one of two or more populations of a species living in different subdivisions of the species' range and varying from one another by morphological characteristics. A single subspecies cannot be recognized independently: a species is either recognized as having no subspecies at all or at least two, including any that are extinct. The term is abbreviated subsp. in botany and bacteriology, ssp. in zoology. The plural is the same as the singular: subspecies.

Contents

Description

The Lord Howe silvereye is sometimes treated as a full species. It differs from the nominate subspecies by being more robust, with larger feet and claws, a longer and heavier bill, with much olive-green on flanks, rump and lower back, and with canary yellow under-tail coverts. [1] [2]

Distribution and habitat

The Lord Howe silvereye is restricted to Lord Howe Island, where it widely distributed through the native subtropical rainforest as well as around homes and gardens. [3] [4]

Rainforest type of forest with high rainfall

Rainforests are forests characterized by high rainfall, with annual rainfall in the case of tropical rainforests between 250 and 450 centimetres, and definitions varying by region for temperate rainforests. The monsoon trough, alternatively known as the intertropical convergence zone, plays a significant role in creating the climatic conditions necessary for the Earth's tropical rainforests.

Behaviour

Breeding

The bird builds a small cup-shaped nest of palm fibre, grass and spider webs, in which it lays a clutch of 2-4 small eggs in spring and summer. [5]

Bird nest nest for bird eggs

A bird nest is the spot in which a bird lays and incubates its eggs and raises its young. Although the term popularly refers to a specific structure made by the bird itself—such as the grassy cup nest of the American robin or Eurasian blackbird, or the elaborately woven hanging nest of the Montezuma oropendola or the village weaver—that is too restrictive a definition. For some species, a nest is simply a shallow depression made in sand; for others, it is the knot-hole left by a broken branch, a burrow dug into the ground, a chamber drilled into a tree, an enormous rotting pile of vegetation and earth, a shelf made of dried saliva or a mud dome with an entrance tunnel. The smallest bird nests are those of some hummingbirds, tiny cups which can be a mere 2 cm (0.79 in) across and 2–3 cm (0.79–1.18 in) high. At the other extreme, some nest mounds built by the dusky scrubfowl measure more than 11 m (36 ft) in diameter and stand nearly 5 m (16 ft) tall.

Spider web device created by a spider out of proteinaceous spider silk extruded from its spinnerets, generally meant to catch its prey

A spider web, spiderweb, spider's web, or cobweb is a structure created by a spider out of proteinaceous spider silk extruded from its spinnerets, generally meant to catch its prey.

Feeding

The silvereyes glean insects from leaves and flowers, as well as eating small seeds, nectar and fruits, particularly guava and will come into gardens and houses, in which people may feed them mince meat and food scraps.

Gleaning (birds)

Gleaning is a feeding strategy by birds in which they catch invertebrate prey, mainly arthropods, by plucking them from foliage or the ground, from crevices such as rock faces and under the eaves of houses, or even, as in the case of ticks and lice, from living animals. This behavior is contrasted with hawking insects from the air or chasing after moving insects such as ants. Gleaning, in birds, does not refer to foraging for seeds or fruit.

Status and conservation

The population of the Lord Howe silvereye has been estimated at about 5,000 breeding birds and stable. It is considered Vulnerable because of the restricted size of the population and area of its distribution. [6]

Vulnerable species IUCN conservation category

A vulnerable species is one which has been categorized by the International Union for Conservation of Nature as likely to become endangered unless the circumstances that are threatening its survival and reproduction improve.

Notes

  1. Hindwood, p.72.
  2. Schodde & Mason, p.688.
  3. Schodde & Mason, p.688.
  4. Hutton.
  5. Hutton.
  6. Garnett & Crowley, pp.608 and 633.

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References