Picture of the Day: And you thought Aintree was dangerous...

The Rangeland Derby Chuckwagon finals at the 100th Anniversary of the Calgary Stampede Rodeo in Calgary, Alberta (Reuters)

It may have fewer jumps than the Grand National, but the race is no less dangerous. The annual Calgary Stampede in Alberta, Canada, has claimed the lives of dozens of animals in its 100-year history, and this year was no different.

Three horses were put down after the chuckwagon racing event, pictured, after two wagons collided on the last bend of the race.

The 10-day festival also includes a rodeo in which riders compete to stay on their horse for as long as possible.