I think the first issue would be - what else can you ultrasound, you know, apart from human babies.

I say that because it would have to be worthwhile for someone to develop the app and then sell it and I highly doubt the market would be big enough if all it serviced was ball pythons.

I've got no idea how an ultrasound works, but I suppose you could plug something into your phone, sort of like is down with credit-card readers now, and then have that device perform an ultrasound.... I dunno.