First of all, Very Happy and Prosperous New Year. Please make spectecular killings in your stock investing.
I didn't realize wombat is so aggressive and hard to domesticate. So I would better exclude.
Goat is look like alright, but atm fruit trees are very young and not so tall. So they could probably damage tree trunks and leaves. But I will ask pet specialist.
As usual and back to basics, atm I am considering ducks and chicks. And probably goat as well.