The time course and abundance of Carnus hemapterus on common kestrel's nestlings depends on their age and the type of nest. Ectoparasites were found in 97% of nests and the majority of nestlings (83%) were observed to be infested between their 10th and 15th day of life. The highest infestation rate of Carnus hemapterus was recorded on 5- to 10-day old nestlings. We have confirmed that the Carnus hemapterus species feeds on blood; however no negative impact on nestlings and the breeding success of common kestrel was confirmed.