A surfer in Australia was presumed dead on Tuesday after drone footage and other signs revealed evidence of a shark attack.

The turbidity also reduces visibility in the water, making it harder for sharks to see. Some of them make mistakes," said Gavin Naylor, director of the Florida Program for Shark Research.

New species of shark, sea butterfly, mud dragon, bamboo coral, water bear, octocoral, and shrimp were just some of the findings that were registered in a directory after the collaborative ...