i hope it is just mites of some-sort. My initial though was that they were moulting, but its just on the 1 year and has been like this for 2-3 weeks. so ill get him sorted, hopefully he fills his eggs next time! they are similar in size to a collared dove, a bit bigger but are not 'dainty' like doves, they are built much like small racing pigeons, kind of muscley and very srtong on the wing. Behave very differently though, its fascinating!