Is hybridization between Lesser Kestrel Falco naumanni and the Common Kestrel Falco tinnunculus possible under natural conditions?

In a numbers of occasions I have seen in Bulgaria Common Kestrels (Falco tinnunculus) with prominent differences in the size of the black spots on the back of the male individuals - from 'normal'...

01 January 1970 1,163 1 View