Pony Express riders had to ride through dangerous weather, such as snowstorms and sandstorms. They also faced wild animals and bandits.

驿马信使的邮差骑士员面临恶劣的天气，比如暴风雪和沙尘暴，还有野生动物和强盗的袭击。

youdao

In one event, riders try to stay on a wild animal for eight seconds.

VOA: special.2009.02.16

It's a beautiful, wild trail for hikers,bikers, horseback riders - and canal lovers.

VOA: standard.2010.04.29

Wild galloping charges sweep back and forth across the plain as riders try to wrest the carcass from one another.

BBC: Following the Silk Road to the end of China

One of the region's richest sources of revenue here is tourism, and trail riders come from across the country hoping to catch a glimpse of the wild horses.

WSJ: Reviving Slaughter of Horses