House Martins start leaving for warmer climes in late August so now’s a great time to spot and appreciate them.

Look for: A bluey-black head and back and white undercarriage, a white rump that ends in a forked tail and a short, black beak.

Spot them: Darting in and out of their mud nests, which they build in the eaves of buildings. They’re seen all over the UK, other than in the north and west of Scotland, especially in buildings close to woodlands or water, where they can find insects to eat easily.

Listen for: A high-pitched trill, similar to a sparrow.