It is known to breed in November and December, building a platform nest of sticks and laying two white eggs, which are sometimes marked with a few brownish or purple spots. Little is known about its breeding ecology. Its loud calls, said to sound like kookaburras, turkeys or yelping dogs, are often given in duet. It seldom flies, instead pursuing prey and eluding danger on foot. Like its red-legged cousin, it is an omnivore.
First described for science by Gustav Hartlaub in 1860, it is monotypic, with no subspecies. The sexes look similar, as do immature birds, though the latter are more patterned on head, neck and back.
Its belly, vent and thighs are yellowish-white. It is a large, mostly grey bird with a long neck, a long tail, and long, slender black legs. It is found from southeastern Bolivia and northern Paraguay south into north-central Argentina. The black-legged seriema is one of two living species of seriemas in the family Cariamidae.
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