Abstract Surveys of breeding colonies of Eleonora’s Falcons Falco eleonorae in the Aeolian and Pelagie Islands, Sicily, showed an unexpectedly high proportion of second-calendar-year (2CY) birds attending breeding colonies. On average, around 20% of all aged birds at breeding colonies were 2CYs.There is evidence that this proportion is increasing at one colony, which may be an early warnin
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