Ancient Antwren

Overview

The ancient antwren (Herpsilochmus gentryi) is a small tropical bird belonging to the family Thamnophilidae. Described in 1998, this species is primarily found in terra firme forests within the Amazon basin of northern Peru and southeastern Ecuador.

Identification

• A small passerine measuring 10-11 centimetres in length.
• Adult males possess solid black crowns with a bold yellowish supercilium, dark grey upperparts, and yellowish underparts.
• Females and subadults feature whitish or yellow spots on the crown and darker olive breasts and sides.
• Song is a long decelerating series of notes that rises slightly in frequency; calls include short 'chups' and longer 'tink' sounds.

Habitat

Restricted to humid terra firme forest in north-central Peru and southeastern Ecuador, typically at elevations up to 200 metres. In Peru, it occupies specific forest types such as varrilal on white sands and irapayal with an open canopy, while in Ecuador it is found on the highest and driest ridgetops. The bird prefers patchy habitats with high-contrast edges and occupies the canopy and sub-canopy layers as a sedentary resident.

Diet

Forages high in the canopy or sub-canopy, gleaning prey from leaves and branches in an active manner interspersed with wing flutters and short hops. Its diet consists of insects, likely including spiders and lepidopteran larvae. It has been documented foraging in mixed flocks with other canopy-dwelling birds, as well as in small family groups or mated pairs.

Did you know?

The species was named after the American botanist Alwyn Gentry, but its discovery was only formalised in 1998, making it a relatively recent addition to ornithological records despite living in an ancient and restricted habitat. Mining and oil exploration pose significant threats because its preferred habitat is naturally uncommon within the broader Amazonia.