Maybe if animals could buy computers and learn to use Face Book, 7 Billion participants may be doable.
Since there are 7 Billion people on earth as of 3/12/12, chickens alone could do it.
There are more chickens than people in the world. Don't believe me? Look it up.
Took your challenge and looked it up.
Holy molly, there are 6 times more chickens than people in the world.
You learn something every day.