Furnarius longirostris is found in northern Colombia and northwestern Venezuela, where it inhabits open country, agricultural land, savannas, and forest edges, particularly in lowland and foothill areas up to approximately 3,300 feet in elevation. It is especially common in the Magdalena River Valley and coastal lowlands. The species is considered plentiful within its range and benefits from deforestation and human land use, as it prefers semi-open habitats. It has also been observed near roadsides and in small towns or villages, suggesting some tolerance for urban proximity.

The bird measures about 7.9 inches in length and has a reddish-brown back, pale orange underparts, a long and slightly decurved dark bill, and strong legs adapted for terrestrial foraging. It is best known for constructing distinctive dome-shaped mud nests with side entrances on trees, posts, or buildings. These nests are reused seasonally and can remain intact for years. Furnarius longirostris typically forages on the ground in pairs or small family groups, searching for insects and other invertebrates. Its vocal behavior includes loud, rolling calls that are often given in duets between mated pairs. The species is assessed as Least Concern by the IUCN due to its broad distribution and habitat adaptability.