Broken legged duckling

From last year's brood, evidence of nature...

This duck, in a brood of 4 or 5, has a broken leg. It limps around, stays put more than the others, and favours its leg. It walks with a limp. I wonder how long it will last? We have a fox, fishers, and other predators in our area, despite being on a long peninsula. We refrain from interfering with 'survival of the fittest'. I blogged about it.