Snorkeler swims with giant turtle bigger than her

Gruesome green algae kills thousands of fish on Thai beach

Toxic green algae kills thousands of fish on beach in Thailand

Stomach-churning green sea kills thousands of fish on Thai beach

Thousands of dead fish wash up on beach as plankton turns sea green

Experts voice concern over Thailand oil spill that may 'sterilise' corals off country's eastern coast

Sea turtle and baby dugong swim together off coast of Thai beach

Lifeboat team rescue dolphins washed ashore in Scotland

Divers swim alongside rare pod of killer whales in Indonesia

Pregnant pygmy sperm whale rescued after washing ashore along Taiwan beach

Friendly pod of melon-headed whales play with tourists

Joy of young seal released back into the sea