Iberá Seedeater

The Ibera seedeater is about 10 cm (3.9 in) long and weighs about 8.5 g (0.30 oz). The species is sexually dimorphic. Adult males have a lead-gray forehead and crown to just below the eye. The rest of their face and their chin, throat, and hindcrown are black to blackish brown. Their back, rump, and tail are brown to olive-brown with white bases on the tail feathers. Their wings are darker with olive-brown edges most feathers and white bases on the primaries that show as a patch on the folded wing. Their underparts are pale yellow to cinnamon. Females have a mostly warm brown head with a buff face. Their upperparts are also warm brown and their tail is darker brown. Their wings are darker brown with sandy edges on the coverts and tertials. Their underparts are warm buff that is palest on the belly. Both sexes have a dark brown iris, a dark horn to black bill, and black legs.

The Ibera seedeater breeds in northeastern Argentina's Corrientes Province and southeastern Paraguay. It apparently winters in southwestern Brazil's Mato Grosso do Sul. There are records in Paraguay as far north as Presidente Hayes Department and sight records in eastern Bolivia. The species inhabits tall grasslands that seasonally flood or are near marshes.

The Ibera seedeater feeds on grass seeds, usually directly from the seedhead while clinging to stems. In the non-breeding season it sometimes forages in flocks with other species of seed-eating birds.