I am raising a small flock of Welsh Harlequins, my first foray into ducks. They are now 11 weeks old. I have lost four ducks so far, all to chicken snakes. I managed to kill three of the snakes, while one got away despite my whanging it repeatedly with a shovel.
I lost three ducklings the first night I put them out in the duck house! The snake was still in there when I opened the door, as it had managed to come in a small crack in the door to the outside pen, but after it ate a duckling it couldn't fit through the crack to get out. Two more were dead in a corner, I suspect from suffocating at the bottom of a pile of frantic ducklings. It couldn't move fast enough to get away from the shovel with a duckling-shaped lump in its middle, so it will never eat another duck! I fixed that crack, then about a week later I went out about sunset and all the ducks were sitting outside in the run, and I knew something was wrong. Sure enough, I opened the door to their house and a snake was lying in wait, hoping for a duck dinner. I went after it with a shovel, but it escaped. It had managed to get through the chicken wire of the run and went into the house through the duck door and just waited. A week or so after that, I came out one afternoon and again the ducks were outside, but I did a quick count and knew I was missing one. I opened the duck house and there was a snake in there just in the process of swallowing the head of my poor duckling. I dispatched it with my trusty shovel. After that I went a few weeks with no snake problems, and figured the ducks were now too big for a snake to try to eat them. I thought I didn't have to worry about chicken snakes again till they started laying, when the snakes would go after the eggs. But, just last week I went out later than usual to let the ducks out into the run, and I could hear them fussing like crazy in their house. This is very unusual, as they normally are very quiet until they hear me saying good morning. As I got to the door, I saw the tail of a snake as one was trying to get into the house through a crack at the bottom of the door. I stepped on the tail so it couldn't get any further in, and it tried for a while but finally backed out. With my feet on the snake I couldn't get to my trusty shovel, so I had to call my dad on my cell phone to come out and help me. He's 87 but really spry, and he plys mean shovel! Needless to say, I fixed the bottom of the door so not so much as a garter snake can get in there now.
Did I mention that I really hate snakes?
Before they start to lay I am going to replace the chicken wire with 1/2" hardware cloth, which should keep the snakes out. Under that is some cyclone fencing, which should keep out the larger, more determined predators like bobcats, foxes, coyotes, dogs, raccoons, etc. Lots of predators in rural East Texas. I would love to let them wander around, but yesterday I saw a pair of hawks circling overhead, so now I have that to worry about.