Black-capped/Tufted Capuchin Sapajus (prev.Cebus) apella

Capuchin monkeys are named after their apparent resemblance to the Capuchin monks.

Tufted Capuchin with leaf The Thinker (Leaf me alone to think)
Tufted Capuchin with leaf Leaf me alone
Tufted Capuchin Incoming
The Tufted Capuchin, also called Black-capped or Brown, is native to forests of the Amazon. They live in groups of a dozen led by a dominant male.
Known for their intelligence, they have been seen fishing using fruit as bait and crack nuts open with a large stones. They also use crushed millipedes on their fur as a mosquito repellent.
Black-capped Capuchin
Black-capped Capuchin
Tufted Capuchin
The Black-capped Capuchin is unfortunately named since most Capuchins have black caps.
In addition to their use of tools in the wild (they are also said to throw rocks at predators such as jaguars), they cooperate with one another and are said to have a sense of fairness.
Black-capped Capuchin
Black-capped Capuchin
They have a basic communication system of sounds and gestures. They will also cooperate with other capuchin/monkey species, although they defend their territories.

In 2011 the "Cebus" genus of capuchins was split into the "gracile" species, retaining "Cebus" and the robust species, moving to "Sapajus". The Black-capped/Tufted Capuchin is in the latter group.