It seems that some of the biggest obstacles when it comes to competing in a triathlon is the capacity to endure the three disciplines and keep your energy until the end. A triathlon in Ireland proved nature can also be a huge difficulty.

Swimmers competing in the event, — taking part in the River Barrow in Athy, County Kildare — were attacked by a vicious swan. In a fit of rage, the animal was seen landing on the competitors and sitting on their heads as they were trying to complete the discipline.

This singular case of man vs. nature was reported by photographer Michael O’Rourke. O’Rourke was photographing the swimmers when he noticed the angry swam warning the participants off in the center of the river. According to him, the swan was merely warming the swimmers to remain away from his family.

“I saw him go from one group of swimmers to another as the female swan and babies swam close by,” O’Rourke commented,  “It was tough for the swimmers.”

In their confusion, the swimmers scrambled for safety. Fortunately, no severe injuries were reported. Although, the attack might have caused a significant delay for the affected participants.

This Irish triathlon, which takes part on an annual basis, was celebrating its 12th edition. Around 2000 entrants took part during the weekend.

They were able to choose one of four events to compete in. For example, swimming between 200 meters and 3,000 meters.