Spanning 6.7 million square kilometers (2.6 million square miles), the Amazon spans nine countries -- Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname and Venezuela.
The world's largest rainforest and river basin, the Amazon is a biodiversity hot spot. It is home to one in 10 of the world's known species, according to the WWF.
Found in French Guiana in 2000, this spider (Ephebopus cyanognathus) has two bright blue fangs that stand out from its otherwise brown body. More than 500 new spiders have been cataloged in the Amazon over the past 10 years.