The ivory-billed woodcreeper (Xiphorhynchus flavigaster) is a species of bird in the subfamily Dendrocolaptinae of the ovenbird family Furnariidae.

It is found in Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, and Nicaragua.

It is a medium-sized member of genus Xiphorhynchus, with a long, fairly heavy, slightly decurved bill.

Their back and wing coverts are light grayish brown to olive-brown with blackish-edged buff streaks.

[3][4][5] The ivory-billed woodcreeper is believed to be a year-round resident throughout its range, though some may move to higher elevations after breeding.

[3] The ivory-billed woodcreeper's diet is mostly arthropods but also includes other invertebrates such as snails and small vertebrates, especially lizards.

It usually forages singly, though sometimes in pairs, and regularly joins mixed-species feeding flocks and follows army ant swarms.

When attending army ants it perches low and drops to the ground to catch prey disturbed by them.

The ivory-billed woodcreeper's song in western Mexico is "piercing whistles in loud cascade that first ascends slightly and increases in volume before descending and slowing, 't-t-t-ttttttttt-t-tewtewtew-tew-tew' ".