Hi, I am looking for large duck breeds that can't squeeze through or fly over our fencing or squeeze under the gates. We have Mallards and Aylesbury ducks. We've lost 3 Mallards to road traffic lately. Unless we re-fence the entire 3 acres, we expect we may lose the rest. They have plenty of ponds, woods, shelter and food but they keep wandering across the road to play in the ditches. TIA for any suggestions.