Were I individually to describe the names, forms, and properties of all
the apes which inhabit the North of Paraguay, this subject alone would
fill a volume. Those called caraya are the most numerous and the ugliest
species. Their hair is tawny, they are full of melancholy, always
querulous, always morose, always snappish. As they howl incessantly day
and night no one chooses to take them home and tame them. They sit by
crowds on trees, and wander about in search of food. When they howl with
most pertinacity it is a sign of rain or storms; the sound they utter
resembles the creaking of waggons with ungreased wheels, and as hundreds
howl in concert, may be heard many leagues off. They are of a middle
size.