Sore feet or suspicious roo?

"Where are you going?" you ask.

"Oh, nowhere in particular" replies the kangaroo, looking over his shoulder at the road behind. "It's just that my um, big feet are sore from hopping all the time, yes.". He wriggles his toes and then looks back again.

There is something suspicious about this roo. He seems to be hiding something and not telling the whole truth.