A number of dead baleen whales have washed ashore in Mexico since the beginning of this year. The Mexican authorities investigating the deaths are baffled as to why this is happening and the cause remains a mystery.
Baleen whales survive on plankton and small crustaceans, and many travel down to Mexico's Sea of Cortez during the winter as part of their annual migration. Investigators have not been able to connect the whale deaths to more common causes, such as toxic algal blooms, fishing gear injuries or collisions with fishing boats, but the continuing mystery is of great concern to scientists and environmentalists. To read more on the story, visit The New York Times (subscription required).