We're all about green grass and grazers this month on Naked Oceans as we take a look at the lush world of seagrasses. We find out why the diversity of critters, big and small, are vital for keeping seagrasses happy and healthy. We meet a mysterious seagrass muncher, the West African manatee and we discover that seagrasses themselves could be the oldest living things on the planet. Among our ocean news we hear how corals find it tough when things get too hot, and too cold; and in Critter of the Month we catch up with a sneaky fish that lurks about the dark depths with its own private sniper scope.