I am wanting to breed some mallards soon, and need a pond in my run. I have an idea but i need your help to know if i can do it. I am wanting to dig a spot, and place some black plastic in it to make it hold water like a koi pond. will this work? Can they puncture the plastic with bill/feet? I am at a lost, if you have a cheap idea please tell me. i need some information asap so i can start this project. ty.