Poison, venom, either way it's not something pleasant for most folks.

Definite eye for them, though. Pretty curious as to the general make-up of the creatures themselves, if you don't mind me doing a quick bio scan in between venom drains and analyses.

[He pulls out his sonic, then, wiggling it between his fingers] Faster than any machine, this. We'll be able to tell exactly what sort of toxins are swimming around in these things.