The grey-throated sunbird (''Anthreptes griseigularis'') is a species of

bird Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...

in the family

Nectariniidae Sunbirds and spiderhunters make up the family Nectariniidae of passerine birds. They are small, slender passerines from the Old World, usually with downward-curved bills. Many are brightly coloured, often with iridescent feathers, particularly i ...

. It is found in a wide range of semi-open wooded habitats in the northern and eastern part of the

Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...

. It is often considered a

subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...

of the

brown-throated sunbird The brown-throated sunbird (''Anthreptes malacensis''), also known as the plain-throated sunbird, is a species of bird in the family Nectariniidae. It is found in a wide range of semi-open habitats in south-east Asia, ranging from Myanmar to the ...

, but the two differ consistently in measurements and

plumage Plumage () is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can b ...

, and there is no evidence of

intergradation In zoology, intergradation is the way in which two distinct subspecies are connected via areas where populations are found that have the characteristics of both. There are two types of intergradation: primary and secondary intergradation. Primary ...

between them.Cheke, R. A., & Mann, C. F. (2008). Grey-throated Sunbird (Anthreptes griseigularis). pp. 247-248 in: del Hoyo, J., Elliott, A. & Christie, D. A. eds. (2008). ''Handbook of the Birds of the World.'' Vol. 13. Penduline-tits to Shrikes. Lynx Edicions, Barcelona.

Description and taxonomy

Ebird describes it as "A small bird of lowland wooded areas with a fairly long, slightly curved, stout bill and yellow underparts. Male has a pale gray throat, a dark reddish cheek and wing patch, a purplish-blue forehead and shoulder, and bottle green on the sides of the throat, the back of the neck, and the crown. Female is fairly drab, with a grayish-brown head and an olive-green back and rump. Male unmistakable. Female similar to several other species, but larger, with a broader bill. Voice not well known, but probably gives a loud “whip!” similar to Brown-throated Sunbird." It was formerly conspecific with the

Brown-throated sunbird The brown-throated sunbird (''Anthreptes malacensis''), also known as the plain-throated sunbird, is a species of bird in the family Nectariniidae. It is found in a wide range of semi-open habitats in south-east Asia, ranging from Myanmar to the ...

but is differentiated reddish ear-coverts and edges of wings, grey throat and overall smaller size with clearly shorter tail.

Subspecies

Two subspecies are recognised: * ''A. g. griseigularis –'' – Found in

Samar Samar ( ) is the third-largest and seventh-most populous island in the Philippines, with a total population of 1,909,537 as of the 2020 census. It is located in the eastern Visayas, which are in the central Philippines. The island is divided in ...

Leyte Leyte ( ) is an island in the Visayas group of islands in the Philippines. It is eighth-largest and sixth-most populous island in the Philippines, with a total population of 2,626,970 as of 2020 census. Since the accessibility of land has been ...

, Dinagat, and Northeast

Mindanao Mindanao ( ) is the List of islands of the Philippines, second-largest island in the Philippines, after Luzon, and List of islands by population, seventh-most populous island in the world. Located in the southern region of the archipelago, the ...

and possibly

Bohol Bohol (), officially the Province of Bohol (; ), is an island province of the Philippines located in the Central Visayas Regions of the Philippines, region, consisting of the island itself and 75 minor surrounding islands. It is home to Bohola ...

, * ''A. g. birgitae'' – Found in

Luzon Luzon ( , ) is the largest and most populous List of islands in the Philippines, island in the Philippines. Located in the northern portion of the List of islands of the Philippines, Philippine archipelago, it is the economic and political ce ...

Mindoro Mindoro is the seventh largest and eighth-most populous island in the Philippines. With a total land area of 10,571 km2 ( 4,082 sq.mi ), it has a population of 1,408,454, as of the 2020 census. It is located off the southwestern coast of ...

Catanduanes Catanduanes (; ), officially the Province of Catanduanes (), is an island province located in the Bicol Region of Luzon in the Philippines. It is the 12th-largest island in the Philippines, and lies to the east of Camarines Sur, across the M ...

and possibly

Polillo Islands The Polillo Islands is a group of about 27 islands in the Philippine Sea lying about to the east of the Philippine island of Luzon. It is separated from the mainland Luzon Island by the Polillo Strait and forms the northern side of Lamon Bay. ...

; larger, particularly in bill length, than nominate, and male's underparts are duller and darker.

Ecology and behavior

Not much is known about its diet but it is pressumed to have the typical flowerpecker diet of small fruits, insects, nectar especially from mistletoes. Typically seen singly, pairs, small groups and joins mixed species flocks. No breeding information but believed to be similar to

Habitat and conservation status

Its natural

habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...

s are tropical moist lowland forest, mangrove forest, second growth and plantations up to 610 meters above sea level. It prefers habitat that is closer to the coast. The

IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...

has classified the species as being of

Least Concern A least-concern species is a species that has been evaluated and categorized by the International Union for Conservation of Nature (IUCN) as not being a focus of wildlife conservation because the specific species is still plentiful in the wil ...

as it has a large range and it is common throughout with the population believed to be stable. However,

deforestation Deforestation or forest clearance is the removal and destruction of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. Ab ...

in the Philippines continues throughout the country due to slash and burn farming, mining, illegal logging and habitat conversion. It is found in multiple protected areas such as

Bataan National Park Bataan National Park is a protected area of the Philippines located in the mountainous interior of Bataan province in the Central Luzon Region. Activities in the park include nature viewing, bird watching, and trekking to its several peaks and w ...

Mount Banahaw Mount Banahaw (; also spelled as Banahao and Banájao) is an active complex volcano on Luzon in the Philippines. The three-peaked volcano is located at the boundary of Laguna and Quezon provinces. It is the highest mountain in both provinces ...

Samar Island Natural Park The Samar Island Natural Park, in Samar, is the largest contiguous tract of old-growth forest in the Philippines. It is the country's largest terrestrial protected area, with an area of . The buffer is spread north to south over the island's three ...

Mount Makiling Mount Makiling (also spelled Maquiling) is an inactive stratovolcano located in the provinces of Laguna and Batangas on the island of Luzon in the Philippines. The mountain rises to an elevation of above mean sea level and is the highest feat ...

and

Northern Sierra Madre Natural Park The Northern Sierra Madre Natural Park is the largest protected area of the Philippines covering the northern range of the Sierra Madre mountains of eastern Luzon. The park is located in the eastern part of the province of Isabela in Cagayan ...

but like all areas in the Philippines, protection is lax and deforestation continues despite this protection on paper.

References

grey-throated sunbird Endemic birds of the Philippines grey-throated sunbird {{Nectariniidae-stub