He looks outside first thing in the morning, searching the sky. He looks at me, signs, looks outside again. He's searching for birds. He loves birds.
Our friend Liv recently posted a photo of a jay on her blog. Roo saw it, and for the next day kept pointing at the computer and signing bird. I told Liv this, and requested more birds on Roo's behalf. She replied with a bird photo post. Roo loved it. Here's his reaction, complete with hooting sound which he now uses for all animals: