Why can't I pick up these corpses?

There are some molerat corpses hanging around my Red Rocket Station that I would like to get rid of. Most of the time, I just pickup up corpses and drag them away. However, I’m not allowed to pick these up for some reason.

The game tells me that they’re too heavy. This seems odd, as I can pick up and drag around full-size humans.

How do I pick these corpses up and move them, so that I can dispose of them?

Before you suggest using the console, let me point out that I’m playing on XBox One.