These enchanting, fascinating creatures range in size from the Pygmy Marmosets, from a quarter of a pound to around 4 inches tall, to the largest Humboldt"s Woolly monkeys, weighing in at up to 20 pounds and over 2 feet tall. For all their numbers - so far 209 species identified - these monkeys live well camouflaged, high up in the thick, tangled vegetation of the rainforest canopy. Nick Gordon"s wonderful pictures and vivid text reveals their secret lives.