Tongue prints work fine on typical phone fingerprint readers, so it is an option.

I tried my noose tip and and tonge, neither worked (Huawei). Toes work (obviously).

People reported that pet's pawns work.

And you know this because you tried it? LOL :)

Actually, my father-in-law, which was pretty funny because he is typically quite reserved.

Iris scan is probably still our best bet, we just need better hardware and software.

How is the iris scanner on Microsoft phones in comparison?