This rather squatty little bird, which according to the nursery rhyme, taps against the window: 'tap, tap, tap, tap, please let me in, please let me in...' sings from early in the morning when it is still dark. In case of danger, it emits the cry 'tsik'. Both males and females fiercely defend their territory against congeners. But actually they desperately need that territory to find enough insects to survive. Therefore, they will fight and expel other robins entering their habitat. It is mainly the red breast that generates recognition and aggression. This aversion to the color red is anchored so deep in the nature of the robin, that it would rather not have a red toy car or ball in ‘his’ garden. And because most birds do not recognize themselves in their reflection, they are also aggressive towards their own image, hence the song of the robin tapping against the window!