AGREE WITH BRUNO, AS WERE ONLY GUESSING, ON LINE, AND THIS CAN BE VERY DIFFICULT AT TIMES,,,,,THE HENS MAYBE EVEN BEEN INJURED IN SOME WAY, BUT THE VET SHOULD BE ABLE TO TELL,,THE BIT THAT WORRIED ME WAS YOU HAVE A BIRD " BADWING" WHICH WAS GIVEN TO YOU,DO YOU KNOW FOR A FACT THAT THE BIRD WAS INJURED,OR DID IT JUST GO LIKE THAT, THE REASON I SAY THAT IS THAT ,IF NOT INJURED, COULD HAVE BEEN PARATYPHUS, AND COULD BE A CARRIER,IM NOT SAYING IT IS THAT, BUT ITS WORTH KNOWING FOR THE FUTURE, GOOD LUCK AT THE VET ANYWAY SNOWY, IM SURE THEYLL PUT IT RIGHT