One of the neighbour's cats was watching them from the top of a wall when I last saw them, as I went to rescue a not-quite-fledged thrush chick from Polka's attack. I don't know if the cat or the fledgling had a role in her outside roosting, but given Polka's spent the last 3 weeks out (bar last night), she probably thinks she knows what's she's doing. I just hope Fez does what his/her mum tells him/her to do overnight - and that they don't come out too early in the morning. A large dog fox was seen nearby earlier this evening.