Ringling Bros and Barnum and Bailey Circus is notorious for beating their animals with bullhooks (weapons resembling fireplace pokers) to perform tricks and forcing their animals to spend up to 100 hours at a time in train box cars.
Their USDA violations are unrivaled, and a compilation of them can be viewed here: http://www.mediapeta.com/peta/pdf/ringlingfactsheet.pdf .
Baby elephant training involves four men tying ropes or chains to the elephant's feet and pulling their legs out from under them, while one or more persons hit the baby with a bullhook and an electric prod.
Elephants are chained most of their lives, only able to move feet or sometimes even inches for days, while in the wild they would walk over 40 miles in a day.
It's time to end this cruelty and stop using any and all animals from circuses.