The scaled spinetail (''Cranioleuca muelleri'') is a species of

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweig ...

in the family Furnariidae. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

to the lower Amazon River in

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

, where it inhabits

várzea forest A várzea forest is a seasonal floodplain forest inundated by whitewater rivers that occurs in the Amazon biome. Until the late 1970s, the definition was less clear and várzea was often used for all periodically flooded Amazonian forests. Althoug ...

s and tropical or subtropical

swampland A swamp is a forested wetland.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p. Swamps are considered to be transition zones because both land and water play a role in ...

Description

The scaled spinetail is a dark bird with scaly-looking undersides, a pale

supercilium The supercilium is a plumage feature found on the heads of some bird species. It is a stripe which runs from the base of the bird's beak above its eye, finishing somewhere towards the rear of the bird's head.Dunn and Alderfer (2006), p. 10 Also k ...

, dark brown upperparts and rufuous crown, wings and tail. The tail is graduated, with basally stiffened

rectrices Flight feathers (''Pennae volatus'') are the long, stiff, asymmetrically shaped, but symmetrically paired pennaceous feathers on the wings or tail of a bird; those on the wings are called remiges (), singular remex (), while those on the tai ...

, pointed at tips. Breast and belly are very pale buff-brown; the feathers of throat, breast and belly are edged dark olive, creating a coarse, scaled appearance. It measures in length.

Distribution and habitat

The scaled spinetail is endemic to the east Amazon River in Brazil, ranging from extreme eastern

Amazonas Amazonas may refer to: Places * Amazon River, known as ''Amazonas'' in Spanish and Portuguese *Amazonas (Brazilian state), Brazil * Amazonas Department, Colombia * Department of Amazonas, Peru * Amazonas (Venezuelan state), Venezuela Other uses * ...

, eastern to southern

Amapá Amapá () is one of the 26 states of Brazil. It is in the northern region of Brazil. It is the second least populous state and the eighteenth largest by area. Located in the far northern part of the country, Amapá is bordered clockwise by Fr ...

and Mexiana Island in

Pará Pará is a state of Brazil, located in northern Brazil and traversed by the lower Amazon River. It borders the Brazilian states of Amapá, Maranhão, Tocantins, Mato Grosso, Amazonas and Roraima. To the northwest are the borders of Guyana a ...

. It inhabits flooded

tropical evergreen forest Tropical and subtropical moist broadleaf forests (TSMF), also known as tropical moist forest, is a subtropical and tropical forest habitat type defined by the World Wide Fund for Nature. Description TSMF is generally found in large, disco ...

, restricted to the

undergrowth Undergrowth usually refers to the vegetation in the lower part of a forest, which can obstruct passage through the forest. The height of undergrowth is usually considered to be 0.3 – 3 m (1 – 9 ft.). Undergrowth can also refer to all ...

and midstory of Brazilian

s (seasonally flooded forests). It ranges from 0–200 m elevation.

Diet and foraging

Its diet consists mainly on

arthropods Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and cuticle made of chitin, oft ...

. The species usually forages in pairs, sometimes with mixed-species flocks, searching for

insects Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs ...

, which it typically gleans from the bark and riverine debris, from undergrowth to mid-storey. It hitches along small branches. During the flood season, the spinetail remains in the middle of the canopy near the water line, looking for insects floating upstream on rafts of vegetation.

Conservation status

The scaled spinetail has been classified as least concern by the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natur ...

(IUCN). It is a poorly known and apparently uncommon species, and the population is likely to be relatively small. Based on a model of future deforestation in the Amazon basin, this species is expected to lose about half of its available habitat over three generations. The primary threat to this species is accelerating

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

in the Amazon basin as land is cleared for cattle ranching and soy production, facilitated by expansion of the road network; it is thought likely to be particularly susceptible to fragmentation and edge effects.

References

{{Taxonbar, from=Q612193 Birds of Brazil Cranioleuca Endemic birds of Brazil Birds described in 1911 Taxa named by Carl Eduard Hellmayr Taxonomy articles created by Polbot