Quail

You may not be able to see the quail in the picture, but there was about 30 of them outside. They blend in with the gray rocks. Nico signed "bird".

Whenever Nico hears the house creak, he signs "bird". The first time he heard a bird on the roof, he got scared. I told him it was just a bird walking on the roof, and so whenever he hears that sound or any other creaking sound that the house makes, he signs "bird".