Barking, Whinnies, and Screams

Sean McCann took this photo of a female spider monkey in Nouragues, French Guiana. Wikipedia states that the spider monkey has recently garnered the title of the most intelligent of the New World monkeys. They are also the largest New World monkey (or among the largest)with those oversized (ergo spider) limbs.

Combine that intelligence with brachiation and their barking, whinnies, and prolonged screaming, and you've got a monkey that would drop property values in a hurry if they infested your neighborhood. I'll stick with belligerent tom cats and yappy terriers.