Last night when I went to lock dogs up the birds in my aviary were we're flying round like mad, obviously they don't fly in the dark so I was concerned , I turned a light on in te kennell then they calmed down, I couldn't see if it was one bird chasing another but again in the dark you wouldn't think so? This morning I looked at them and 2 siskins and a mule have got feathers missing above there beaks , looks like mites but I'm sure I wold have noticed it yesterday as I had a good look at them, I'm thinking its maybe damage from flŷing into te mesh? Has anyone had this before?