Guiana dolphins swim in the Bay of Sepetiba, on the coast of Rio de Janeiro State, Brazil, Thursday, Jan. 11, 2018. Brazilian scientists say a virus is the main cause for the death of close to 200 guiana dolphins in little more than 40 days on the coast of Rio de Janeiro state. What led to the outbreak and how long it will last are still unknown. Scientists are trying to determine other possible causes for the death of the dolphins. (AP Photo/Leo Correa), APTOPIX