The Eulacestomatidae family of birds has only one species: the Wattled Ploughbill (Eulacestoma nigropectus). It is found only in the mountain forests of New Guinea.

The Wattled Ploughbill is a small bird with a short, thick bill and colorful feathers. Males have a bright yellow face and a pink wattle (a fleshy flap of skin) on the side of the face near the bill. Females are less colorful and lack the bright facial markings.

These birds mainly eat insects and other small invertebrates. They are shy and difficult to spot because they often hide among dense forest plants while searching for food.