Sand Martins

There are several sand martins flighting low over the wheat fields at the back of the house. The nearest sand quarry is about a mile away and as there are plenty of fields between there and here, it is somewhat surprising to find them. At a higher level numerous swifts are also feeding on their aerial prey. The swallows appear to be confining themselves to the wheat fields at the front of the house so, there seems to be some sort of demarcation taking place here.