Yesterday, during the very warm humid weather, I saw two separate flocks of House Martins in Capel Dewi (Llandysul), both about 50 strong. The first had clustered together tightly on the church roof and the second was fluttering about among the branches of an old pine tree. I fancied that they were both having a kind of pre-migratory briefing/bonding session, though that interpretation may be completely inaccurate!