Dawn Singing Behaviour
In spring, many male passerine birds sing at a high rate at dawn, referred to as the dawn chorus.
In blue tits (Cyanistes (formerly Parus) caeruleus), the dawn chorus coincides with the fertile period of the female. Previous studies on blue tits showed that characteristics of the dawn chorus correlate with male reproductive success.
We investigated the influence of male age, extra-pair paternity, survival and testosterone on the dawn singing behaviour of blue tits.