[Ford flipped his book open to a fresh page and crouched down on his haunches to get a better straight-on angle.]

Oh, yes, yes. Very normal. It's been happening with regularity for almost a decade now, I believe. My best guess is that this universe has some sort of magnetic attraction for wormholes, and so whenever someone falls through one there's a high probability they'll be funneled here.

[He was clearly speaking to Wilbur, but his eyes were fixed on that Pidove. His sketchwork was quick, clean and detailed, as though he'd got a lot of practice taking field notes -- which he had. Next to him Fay crouched in much the same position, though every now and again her ears twitched and she leaned forward like she was going to try and boop her snout into the Pidove again. She didn't, of course, she knew it'd get in the way. But also: she wanted to.]

Of course that's only theory.