Summary: Alien behaviour can be hard to figure out.
Donna felt a little disconcerted. As alien planets went, this one seemed friendly enough, but why did the people keep coming up to them, patting and stroking them? It sounded as though they were murmuring “Good, good”.
“Why are they doing that?” she hissed at the Doctor when, for a few moments, she wasn’t being pawed at.
“No idea yet. Just go with the flow for now; I’m sure everything will become clear. They’ve probably never seen people like us before.”
The aliens looked like squat blue beakless penguins.
“Fine, but if they want to mate with us, we’re leaving.”