Abstract
The mean number of Willow Tits Parus montanus in single‐species flocks was significantly larger than in mixed‐species flocks of Willow and Coal Tits P. ater. Both flock size and the tendency of Willow Tits to join mixed‐species flocks were negatively correlated with ambient temperature, probably because each bird, when the metabolic rate of the birds increased, could allocate more time to foraging due to improved predator detection by many eyes. The vigilance time of Willow Tits decreased with flock size and was determined by the total number of individuals in a flock rather than by the number of Willow Tits in mixed‐species flocks of Willow and Coal Tits.
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