Cookie, a Major Mitchell cockatoo at Brookfield Zoo, celebrated his 70th birthday today, and his birthday celebration this morning kicked off the zoo's Bird Weekend. Cookie is the last surviving original zoo resident, part of the intial collection of animals when the zoo first opened its gates in 1934. Although the average life expectancy of a cockatoo is between 50-60 years old, they can live to be as old as a hundred. Read more about it, and check out the zoo website for more Bird Weekend activities.