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In habits the guacharo is wholly nocturnal, slumbering by day in deep and dark caverns which it frequents in vast numbers.

These caves are frequented by a species of night-hawk, called guacharo, which nests in the recesses of the rocks.

The guacharo is of the size of the common fowl; its hooked bill is white, like that of the goat-sucker, and furnished at the base with stiff hairs, directed forwards.

The guacharo is of the size of our fowls.

The guacharo builds a solid nest like a cheese with a concave top.