Red-legged Seriema Bird. The Seriema birds are the sole extant members of the small and ancient clade Cariamidae. The Seriemas are large, long-legged terrestrial birds that range from 70 to 90 cm. They live in grasslands, savanna, dry woodland and open forests of Brazil, Bolivia, Argentina, Paraguay and Uruguay. There are two species of seriemas, the Red-legged Seriema (Cariama cristata) and the Black-legged Seriema (Chunga burmeisteri).