Earlier today I had a dragon skeleton fall from the sky and land next to me right after I arrived on scene via Fast Travel. Later, I left the Sanuarach mine and had a Hagraven hit the ground. She was dead and I got claws and feathers off of her so it wasn't a total loss. I'm thinking either a dragon flew over head and dropped his take-away or it's a male dragon, I'm a female dragonborn and it's a gift in lieu of flowers or chocolates 'cause he likes me.