Alagoas Curassow vs Razor-billed Curassow

Extirpated from wild (EW). Calls documented from captive birds: a deep, resonant booming similar to Razor-billed Curassow; flocks give low, guttural clucking contact calls.

Emits a deep, resonant booming call; male's boom is among the most powerful of any cracid. The thundering boom echoes far through western Amazonian terra firme forest at dawn.

Glossy black body; white lower belly and undertail; massive compressed red bill with orange-yellow tip; no head ornamentation. Now extinct in wild; the large red razor bill was its most …

Glossy blue-black overall; white lower belly and undertail coverts; distinctive laterally compressed blade-like red bill with small red knob at base; no crest; legs red.