Here is the trail of a seal, showing the mark in the middle from the hind flippers. The outer marks are from the front flippers. The ham radio is in photo is about 12 inches long for scale. Direction of movement is from right to left. A seal trail in soft sand showing the drag mark from the animal's body in the middle of the marks from the front flippers.
Direction of travel is toward the camera.
This is a single flipper mark. The outer area shows some claw marks. The coin in the photo is a quarter for scale. Here is a trail with the marks in the middle representing the hind flippers. Crossing the photo from upper right to lower left are the tracks of a raven.