If I could breed lizards to do economically useful work and rewarded them for it would there be an ethics issue?

We eat chickens and cows. Horses do work and the French eat them. Elephants work in South Asia. There was a fuss about using monkeys to harvest coconuts but it was mostly about misusing them not about the work. And besides these are reptiles. We grow penicillin mold for medical treatments, the penicillin dies.

Very small lizards could, perhaps, assemble thumb drives or sort nano particles more economically than people with machines. But is it ethical?