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anything 1" in diameter and bigger depending on the breed. lesser weasel is the smallest and can fit through smaller than 1". yes they r nocturnal. a weasel is part of the mustelid family which includes also- mink, skunk, ferrit, otter, wolverine, martin and fisher.
if u don't take the steps to protect ur flock u could loose entire flock. a mink for example will wipe a whole flock out in one nite. a weasel will take a few a night and come back till gone usually. so if u r haveing preditor probs be prepared.