The seriemas are the sole extant members of the small and ancient familyCariamidae, which is also the sole surviving family of the Cariamae. Once believed to be related to cranes, they have been placed by one recent study near the falcons, parrots and passerines. There are two species:
- Red-legged Seriema, or Crested Cariama, Cariama cristata. This is found from eastern Brazil, to central Argentina. It is bigger and nests on the ground or in a bush or tree up to 3 m (9.8 ft) above the ground.
- Black-legged Seriema, Chunga burmeisteri. This is found in northwest Argentina and Paraguay. It nests in a tree.
The seriemas have an extensible second claw that is raised from the ground. This resembles the "sickle claw" of Velociraptor and its relatives.