These creatures are so fragile that the moment they are pulled out from the water, they collapse and disappear.

"You can tell by the 2 frills on its back." Beachgoer captures photo of strange-looking slime creature found on beach: 'Single fleshy mass' first appeared on The Cool Down.

The Rock Pool Project in Plymouth says the non-native sea hare looks "alien-like".

Everything really is bigger - and stranger - in Texas. This year proved the Lone Star State is full of wild surprises after several Texans spotted some rare and unusual encounters with sea creatures ...