From the 20th to the 25th of April, Lycabettus Hill was "flooded" by Ficedula spp. flycatchers. Birds were everywhere, calling and defending their space from each other. In a patch less than 100 meters long once could see all three species!
Collared Flycatchers were the first to arrive and in the early days they outnumbered
Pied
As days passed,
Pied Flycatchers built up their numbers and dominated the forest.
Semi-collared Flycatchers were also seen, in much smaller numbers of course.