The cliffs above the west beach in Cromer are visited each year by Sand Martins. They arrive before Swallows and House Martins. They will reuse their nest sites on the cliff face if these have survived the winter – or they will start again. It is always a relief when they return in the spring and the Martins, Swallows and Swifts seem to have done well this year. What we noticed recently is that the Sand Martins’ cliff face has been taken over by up to 200 sun bathing House Martins – distinguished by their white rumps. Presumably they are enjoying warm conditions here before returning to their winter home in sub Saharan Africa.