MEXICO CITY (AP) -- Mexican authorities are investigating the deaths of 36 marine animals that washed up on an island in the Gulf of California.
The federal environmental prosecutor's office says in a statement Thursday that 21 dolphins, 4 sea lions and 11 sea turtles were discovered at Altamura Island, off Sinaloa state.
Their decomposing remains were found on the beaches and floating in the water by guardians who patrol the area.
The private island is home to ranching and tourist concerns as well as a sanctuary for flora and fauna, with dunes stretching some 12 miles (20 kilometers).
Marine animal deaths are common off Mexico, but it's rare to find so many at one time.
Authorities are seeking to determine the cause of death and avoid possible health threats to animals and people.