The most difficult Amazon riddles

Launched June 10, 2011, Aquarius is NASA’s first satellite instrument specifically designed to study the salt content of ocean surface waters. The complete first year dataset of NASA's Aquarius instrument reveals seasonal changes in the Amazon River's plume. Depending on the prevailing currents, the river's freshwater outflow heads east toward Africa or bends up north to the Caribbean.

Research conducted in a nesting site in Brazil concluded that the harpy's prey basis was composed in 79% by sloths. In a similar research venture in Panama, 53% of captures were sloths.