I've stumbled upon many animal carcasses on my fishing trips that washed up on the shore: seagulls, ducks, carps, swan or crane (hard to tell ... was really big, white, feathery, and flat), frogs, etc.
One day, I came across this huge frog carcass ... I took a picture of it next to my standard sized frog lure.
What unusual carcasses have you come across?