You want a part-time job? Well, as it happens I need some Weasel Eggs for my experiments. I suspect the experiment will be very long and tedious.
Weasels are mammals and don't lay eggs? Hey, I'M the scientist here. You're just an adventurer with a weird little thing following you around. And I'll pay you for them. I need a steady supplier.
Interested?
For a talented wizard, thaumaturgical experiments are an unavoidable penance.
Nevertheless, for the sake of a better world, he has no choice but to spend all of his youth on these boring calculations.