I got her a few days ago from a feed and seed along with a few of her siblings, I'm assuming they are about a week old. The thing is, she is extremely aggressive and attacks her siblings mercilessly. I put her in with some older ducks and she went after them too! Right now she's in by herself and a stuffed giraffe (which she adores and never strays too far from). She will still lower her body and hiss at anyone, plus she goes after hands and fingers angrily. Luckily she is still little and her bites don't really do anything, but what can I do so she wont grow up to be an attack mallard?