Below is a picture of a gull pellet. Gulls cough up compacted pellets of previously swallowed prey parts that they can't digest. Pellets are interesting because they offer clues about the gull's recent food items. They're miniature treasure chests of mystery objects that tell a story about the gull's interactions.
Can you identify the different types of prey in this pellet? I'll show you two pictures — one of the pellet in its original state when I first found it. And a second photo when I spread the pieces apart to make it a little easier to see the individual items.