The Common Blenny is a fish that is also known as the Shanny and is very common around the rocky shores of England. It can also be found hiding under rocks and crannies in rock pools when the tide is out. It is also known as the Sea Frog because it basks in the sun on weeds outside the water and quickly jumps back in when it is disturbed, just like a frog does. This fish is able to breathe out of water for as long as its skin stays moist.

The Common Blenny is about sixteen centimetres in length and has a scaleless skin with a layer of soft slime over it. The slime stops it from drying out if it gets stranded on a beach between tides. It can be a grey, olive-green or brown colour with dark markings and can change its colours to match its surroundings. The male Common Blenny turns almost black between April and August.

The female Common Blenny lays her eggs in crevices or under stones in the water and the male guards the eggs until they hatch. The Common Blenny is a bold fish that will bite humans with its strong teeth if it feels threatened or frightened.