I have a new duck who is a little over 3 weeks old. I got her as a companion for my other duck who just lost her life partner a couple weeks ago. Their friendship is developing great, but I must say this duck isn’t operating on all cylinders. She has bitten and lacerated my eye, chases my dog, and today I saw her eat two large rocks. After losing my last duck, I’m Severely traumatized and worried. I have never had to worry about this my other ducks, they simply wouldn’t do that. They eat their grit, and don’t even try to chew on things that size. So far she has no symptoms. This happened about 20 minutes ago. Our vets are not open. I don’t know what to do. I can’t imagine this is good. I just don’t know why this duck would do this. Please help anyone who knows.