Distinctive bushy tentacles above each eye are the key identifying feature of the Yarrell's Blenny, Chirolophis ascani. Growing to about 20cms and generally various shades of blotchy brown in colour, it lives under stones and in cracks and can "stand" on its front fins as shown here. Sometimes confused with the Tompot Blenny but the latter has brighter colours, is more stocky and the head tentacles are branched as opposed to bushy. Yarrell's Blenny has a more northern distribution. See the separate photograph of the Tompot Blenny for the difference.
North Sea. St. Abbs Marine Reserve