Llanwrthwl has 3 seperate colonies of Swift – one of which is under the eaves of our house. Its hard to tell exactly but I would estimate around 6 pairs nest each year. At this time of year we eagerly anticipate their return – we can hear their screams under the roof from inside the house. The last two years saw the birds arriving back on May 6th. In 2009 it was May 5th. This year with the poor weather they were two days late – May 8th! sat outside this morning, 4 birds arrived from nowhere, screaming around the oak tree opposite – glad to be ‘home’ after an 8 month sojourn to Africa!