Usually in my region swallows are coming during the middle of February. This year they are not yet arrived. I have a neighbourhood that he is expecting them every year because swallows come to his garage and do their habitat there. Every year one swallow arrives few days before the rest of the gang. Then the others arrive by groups. This year they are not here, yet. It is for maybe two reasons: that the cold weather will continue or that something is happening that the swallows are not emigrating .
When it is time to leave, swallows leave by groups and one only swallow is left for some days. Then finally this solitary swallow leaves.
When it is time to leave, swallows leave by groups and one only swallow is left for some days. Then finally this solitary swallow leaves.