Lost bright green parakeet named Kiwi with a yellow beak near the park by the library in Watertown.

I lost my parakeet, Kiwi, around Watertown last evening. He's a small bird with bright green feathers and a distinctive yellow beak. I last saw him flying near the park by the library. He was startled when a dog barked and just took off! I've been searching nearby since then, but I haven't had any luck finding him. I'm really worried he might be lost and cold.