In the past, we've had ducks get limpy for no apparent reason - no swellings, no puncture wounds, etc. Sometimes, after I give them cage rest, they've recovered. Sometimes not - can't walk around to keep up with other ducks, eventually stop eating in the enclosure and don't make it (this happened twice). The ducks are khaki campbel/mallard crosses. We have the bigger sized kiddie pools and lots of water in the rainy season. Seems like the lameness occurs during the dry season more often. Do ducks get lame from too much running around? They free range on 2 acres. Would I be better off with runner ducks? Would they be hardier on dry land? Thanks for your input.