[Unsurprisingly, the moment the butterfly flutters off her hand, it makes its way toward him. Unlike the natural ones in the facility, which would settle eventually after time--this one didn't hesitate. Her butterflies had always been drawn to him in some strange way, which made a little more sense now than it did back when he'd first experienced the phenomenon.]
I always seemed to pick one or two of them up on my rounds. It didn't matter the time of day; eventually I'd stumble across one and it would follow me for awhile.
[He lifted his hand up slightly to let the butterfly lift off again, and it did, fluttering nearby.]
There weren't many of them. Maybe four or five in the whole facility but they were always there.
I assume bats were picked because they are nocturnal animals. Butterflies...aren't.