Olivaceous Woodcreeper

Overview

The olivaceous woodcreeper (Sittasomus griseicapillus) is a small passerine bird within the ovenbird family Furnariidae. It is the sole member of its genus and is distributed across a vast range, from central Mexico through Central America and into South America.

Identification

• Possesses a slim body with a short, straight bill, distinguishing it by the notable absence of streaks or spots common to other woodcreepers.
• Adults range from 13.1 to 19.3 cm in length, with plumage varying from olive-brown to grayish depending on subspecies, often featuring rufous rumps and tail feathers.
• Songs vary significantly by region, ranging from rapid staccato trills in northern areas to alternating series of clear whistles in Amazonia.

Habitat

The species inhabits a wide variety of wooded landscapes, favouring mature forests such as rainforest, cloudforest, and montane forest, but also occurring in secondary growth, plantations, and scrublands like caatinga and cerrado. It is found across elevations from sea level up to 2,300 m, though specific subspecies have different preferences. Its range extends from central Mexico south to north-central Argentina, excluding only Chile, French Guiana, and Suriname on the mainland.

Diet

Its diet consists primarily of arthropods, particularly beetles and Hymenoptera, but also includes seeds, fruit, and small vertebrates. Foraging is conducted by hitching up tree trunks and branches in the mid-level to subcanopy, often joining mixed-species feeding flocks or following army ant swarms. It is also known to associate with foraging tamarin groups and occasionally catches flying prey like termites in mid-air.

Did you know?

This bird occasionally associates with foraging groups of tamarins, exploiting the opportunity to snatch prey that has been startled by the monkeys. It has also been documented catching flying termites in mid-air, a behaviour not typical for many woodcreepers.