Half-collared gnatwren
The tawny-faced gnatwren or half-collared gnatwren (Microbates cinereiventris ) is a species of bird in the family Polioptilidae, the gnatcatchers. It is found in Bolivia, Colombia, Costa Rica, Ecuador, Nicaragua, Panama, and Peru.
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TerrestrialTerrestrial animals are animals that live predominantly or entirely on land (e.g., cats, ants, snails), as compared with aquatic animals, which liv...
Oviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive...
Flocking birds are those that tend to gather to forage or travel collectively. Avian flocks are typically associated with migration. Flocking also ...
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Not a migrantAnimals that do not make seasonal movements and stay in their native home ranges all year round are called not migrants or residents.
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starts withThe tawny-faced gnatwren is 9 to 11 cm (3.5 to 4.3 in) long and weighs 10 to 14 g (0.35 to 0.49 oz). The nominate subspecies has a rusty face with a rufous crown and a thin black stripe behind the eye. A wide black malar stripe ("moustache") separates its face from the white throat and upper breast; the last has thin black stripes. Its back is brown and its underparts are gray. The sexes are alike. The other subspecies differ in the intensity of their cheek and underparts colors, and some do not have the black stripe behind the eye.
The subspecies of tawny-faced gnatwren are distributed thus:
The tawny-faced gnatwren generally inhabits the lower strata of wet, humid, primary and secondary forest, mostly below 750 m (2,460 ft) elevation. The exception is M. c. unicus, which is "known only from a single specimen... on an undetermined date between 1930 and 1943" in a much drier biome.
The tawny-faced gnatwren's diet is primarily ants and other insects but also includes spiders. It forages through foliage and leaf litter while hopping through undergrowth near the ground. It regularly joins mixed-species foraging flocks but rarely follows army ant swarms.
Information on the tawny-faced gnatwren's breeding phenology is sparse. Nesting has been recorded in April in Costa Rica and between December and May in Colombia. The one fully-described nest was constructed of green moss with a soft inner lining. It was attached to the trunk and a limb of a broadleaf shrub and contained two eggs.
The IUCN has assessed the tawny-faced gnatwren as being of Least Concern. However, "Three races...are primarily restricted to ecoregions considered...to be seriously threatened as a result of habitat loss".
