Why does it always have to be the dead flat things

KD loves to sniff around and I have a bad habit of taking her for a walk in the evening on a flexi-leash and letting her wander ahead. A couple of weeks ago when we were out walking, she picked up something dead and flat and I had to get her back to me and force her to drop it. Yesterday morning when we were out walking, she was trailing behind me a bit sniffing a fence line. I started to cross the street and she came to catch up. I looked down and there in her mouth was a dead squirrel (best guess). I gave her a quick yank on the leash and she dropped it. Yuck.