Yes they will, and a member had a mink kill one of her geese last year. very sorry for your losses I hope you are working to secure your barn now from 4 legged and flying predators.I also have a question about this. We have a had a pretty bad weekend. I have my chickens and geese in our barn in pins except my rooster he roosted on a beam in the barn. The question I have last Friday my husband and I went outside to let the animals out and found my rooster dead his head was hanging off the body was not touched. We think he flew down to protect the hen and got it. Sat morning we went back out there and I thought my hen would be safe because the pin she was in is on concrete so I didn't think a weasel could get to her thinking that's what it might be, well what ever it is tried getting her through the pin tore her up pretty good. Well I put her in the garage last night and thinking the geese where safe because they are pretty big geese and something killed one of my female geese. It ate her and not trying to sound grouesome but it ate her Brian it look like. Well when my husband and I both went in there to look at her a owl flew out of the barn will they do that?