the oldest cow in the world! the smallest dog in the world! The smallest cow in the world the loneliest bat in the world! the heaviest cat in the world! the pluckiest pig in the world! the funniest kid in the world / the most stubborn swan in the world! the largest collection in the world 蓝铃的生日：世界上年纪最大的母牛：the oldest cow in the world!