The male Cuckoo Wrasse, Labrus mixtus, is probably Britain's most colourful fish although the female is a light brown or reddish colour colour - see the next picture. They are very inquisitive and will follow a diver for ages, peer in his mask and even chase and bite the exhaled bubbles. Cuckoo Wrasse are born female and only in later life do a some change into males. They are territorial and the male makes a nest and attracts a female by means of a courtship display. They are quite long-lived and can reach a length of 35cms but are of no commercial value. More common on western and southern shores.