The Amazon Rainforest is known to be home to 427 mammal species, 1,300 bird species, 378 species of reptiles, and more than 400 species of amphibians. The biggest water-dwelling mammal, and probably the biggest mammal in the Amazon altogether, is the Amazonian Manatee. A distant relative of the elephant, the Amazonian Manatee can grow up to 2.8m and weigh up to 540kg, with the female usually larger than the male of the species. Learn more by choosing a category below!