Blue tits are a common species often seen in gardens, woodland and scrub. They feed mainly on insects in the summer but will also eat nuts and seeds in the winter. http://www.irthlingboroughlakesandmeadows.org/wp-content/uploads/2015/08/XC212316-LS113266-Blue-tit-song-david-m.mp3 Illustration by Butterfly Tracks Publications. Blue tit