Considering sprites are basically made out of whatever two things you put in them and revived my friend's dead nanna from just her ashes, I don't think sprites have a standard for normal.

[He shrugs, then dumps the little tape rope back in the bucket he'd stored the nails and screws in. He has no further use for it but he has no better idea of where to put it just yet.]

But yeah, I've got a heartbeat. Crows do, humans do. You want to know the real mystery? I got no idea what my tail's made of. You think it's just a big tube of muscles?