tiny 2″x2.5″ portrait of my fat man Ziltoid
Humans using animals in weird medical ways (that don't hurt the animal). People used to to use frogs as pregnancy tests! A bit of a woman's urine was injected into a female African clawed frog, and if it laid eggs 24 hours later, it indicated the woman was making pregnancy hormones! And the first estrogen replacement pills for menopausal women, Premarin, was extracted from pregnant mare urine!