The yellow one is big. She's feisty and the bravest one. So far all the cats seem scared of the ducks. I hope that sticks. Just in case, we've got the cage bars over the top. I'm moving them to a room the cats can't get in as a precaution. I'm more afraid of my kid getting hold of them. While I was fixing their cage she grabbed one by the wing and her hands clamped down hard. Thankfully she didn't hurt it. She easily could have though.