As one of the smallest of European birds the Wren is instantly recognisable with a tiny, round body, brown plumage & short perky tail. Both sexes look alike & juveniles look similar to the adults but with a warmer tone to their plumage. They may be tiny but rather surprisingly wrens have one of the loudest voices around. It has a loud song consisting of a series of clear, shrill notes & its scolding alarm call can even scare a cat!