Robby's question gets a blink from Ford, but after a moment he simply waves a dismissive (six-fingered) hand at the question.

"No, no, I know they're usually seasonal but I'm certain I saw one."

He's not clued in enough to realize Robby might be asking for reasons other than seasonal inconsistencies. Instead he reaches into an inner coat pocket and withdraws a thick, leather bound journal. He's certain he's got a specimen sketch in here somewhere...

"The smell is unmistakable, for one." And pause, and then: "Though I suppose that means I've probably lost the trail already..."