"A titi monkey that purrs like a cat is just one of hundreds of species discovered in the Amazon in recent years, according to the World Wildlife Fund. The organization compiled a list of the 441 new species as scientists were about to describe 258 plants, 84 fish, 58 amphibians, 22 reptiles, 18 birds, and one mammal found between 2010 and 2013." (Quoted from article)