I posted on Predators, but thought maybe real goose people may know more. Last year I let my 1st year Tufted buff goose set some of her eggs inside the night pen(10 x10 section of a carport aviary ,roofed, surrounded by 2X2 wire with 3 ft.of 1/2 hardware cloth around the perimeter with a 2 ft apron of fence around exterior and a then a 4 ft with hotwire top and bottom fence around day yard, which opens thru gate to a 4 ft. field fenced pasture of an 2 acres, which they 'freerange" in the daytime. It was a straw nest on pond rock bottom inside the aviary. Twice she set eggs, each time the eggs disappeared slowly. I never candled them, because I was just waiting to see what happened. Her mate and other pair were with her at night and she stayed on nest , except for a few times a day. No shell pieces or anything.... I did have the gate open in daytime to her pen. I also saw a 3-4 ft. Kingsnake or ratsnake go into aviary a month or so later. However there was a hole in ground inside aviary about 2" across. Sometimes I see mice run out when I hose it down. Predator people said a King snake would not eat goose eggs. I live in farmland touching a national forest in nw Ga. Nothing big would have gotten in there in daytime (fence and hotwire and I am home all day and have 4 dogs)--And I lock up birds at night. So I am trying to figure out what happened to two sets of eggs she tried to set with no traces of shells? This year I have put large plastic bins in the a aviary with straw as nest boxes..... thinking it would keep snake or a rat from coming underneath.... Or maybe I need to make a solid bottom in aviary instead of pond rocks over dirt. hhmmm anybody got an idea what can make two sets of 10 eggs just disappear gradually?