Chaco Earthcreeper vs Greater Thornbird

In short

The Chaco Earthcreeper and Greater Thornbird are both ground-foraging birds in the Furnariidae family, but they can be distinguished by their plumage and behavior. The Chaco Earthcreeper is darker with a contrasting white throat and rufous forehead, while the Greater Thornbird has a more uniform coloration. Behaviorally, the Earthcreeper seldom cocks its tail, unlike the Thornbird.

Identification tips

• Look for the white throat and rufous forehead on the Chaco Earthcreeper.
• Note the buffy supercilium in southern Chaco Earthcreepers.
• Observe tail behavior: Earthcreeper seldom cocks its tail.
• Listen for vocal differences: Earthcreeper has slow, ringing notes.

Size

Both species are similar in size, typical of small to medium-sized ovenbirds.

Plumage

The Chaco Earthcreeper has a dark belly, white throat, and rufous forehead, with a buffy supercilium in the south of its range. The Greater Thornbird, on the other hand, lacks these contrasting features and has a more uniform plumage.

Behaviour

The Chaco Earthcreeper forages on the ground and in shrubs and seldom cocks its tail. The Greater Thornbird is also a ground forager but may exhibit more tail movement.

Habitat

The Chaco Earthcreeper is found in semi-arid areas, light woodlands, and espinal habitats, often where ground bromeliads are present in the north. The Greater Thornbird's habitat preferences are not detailed here but are typically similar, favoring dense scrub and thickets.

Voice

The Chaco Earthcreeper's song consists of slow, ringing notes, while the Greater Thornbird's vocalizations are not detailed here but are likely to differ.