Best livestock for the tiny farm

Trying to figure out the best animals to have on an a 2-acre farm.

[edit] Requirements

minimal feed requirements: don't want to buy in hay or grain
maximum manure production: to use for direct spreading on the market garden, and for composting
winter-hardy: can deal with the coldest nights (southern Ontario, -20C/-4F,) minimal winter protection

cows: not enough pasture (maybe for a couple), need lots of hay in winter
Chickens: good, manure, eggs, meat, move around in a chicken tractor, need feed, especially in winter
goats: need hay in winter
sheep: need hay in winter, need shelter in northern winter (three walls and roof at least), good on pasture (4 sheep per acre), need shearing once per year
llamas
pigs
alpacas would also be good, especially geldings. you would have fabulous fiber from them, you can pasture up to 8 per acre, they do NOT eat the grass to the ground as sheep do, use communal dung piles for easy cleanup, and the manure is fabulous. they 'say' the manure can be used as is and doesn't burn plants, but I would definitely compost it first. good luck!