Imagination of a 3 year old

Kaden has these "friends" around the house and they happen to be birds. He only plays with them sometimes but it's very interesting to watch...and hilarious. He jumps up to catch "the bird" and then he'll pet them, feed them and even put them to bed. When he tries to catch them you can see his eyes trying to focus on one but it seems as though there a lot of birds flying all around by the way his eyes move all around. He thinks they are so cute and always gives them kisses. At first I was a little worried about these little "bird friends" of his but I guess its normal at this age.