I photographed this one 10 days ago near the Delisle River in Quebec, Canada. There were geese and ducks and one gull in the river, busily feeding themselves. But I can't tell what species this dead one is. As judged by the size of my shoe, it was a relatively large bird. A duck perhaps?
So, once again, if you do a lot of walking around and pay attention to what's on the ground, you are likely to see plenty of dead birds, in addition to snail shells.