What is "guacharos"

Usage examples of "guacharos".

They sat in the cloister with their backs to the east wall, and when Stephen had told him all he knew about albatrosses, which was not inconsiderable, he having sat with them for hours at their nesting places on Desolation Island, sometimes lifting them off to look closely at their eggs - all he knew, particularly about their flight, Eduardo spoke with great eagerness of the guacharo, a very singular bird he had discovered in a vast cavern near Cajamarca in the Andes, a vast cavern indeed, but scarcely large enough for the prodigious number of guacharos that tried to get in, so that some were left outside.