Serbia's Viktor Troicki watches a bird fly away after it landed on the court during his first round match against Spain's Daniel Munoz de la Nava at the Australian Open tennis tournament at Melbourne Park, Australia, January 19, 2016. REUTERS/Tyrone Siu 

Sri Lanka's Jehan Mubarak (L) and India's Rohit Sharma watch as a monkey runs past them middle of the ground during the third day of their first test cricket match in Galle August 14, 2015. REUTERS/Dinuka Liyanawatte 

A bees nest is removed from the goal posts before the Oldham Athletic vs Blackburn Rovers match during the Pre Season Friendly at the SportsDirect.com Park in Manchester, England, September 25, 2015. Action Images / Ed Sykes Livepic 

A pair of Rooks walk past a golf ball on the ninth hole during the first round of the British Open golf championship on the Old Course in St. Andrews, Scotland, July 16, 2015. REUTERS/Paul Childs 

A wild rabbit runs on the track during the qualifying session for the Italian Grand Prix at the Mugello circuit, Italy, May 30, 2015. REUTERS/Max Rossi 

Lazio's mascot, a white headed eagle called Olimpia, flies before the start of their Italian Serie A soccer match against Empoli at the Olympic stadium in Rome April 12, 2015. REUTERS/Alessandro Bianchi 

FC Thun's goalkeeper Guillaume Faivre shows the way out to a marten which was running on the pitch during the Swiss Super League soccer match against FC Zurich in Thun March 10, 2013. REUTERS/Pascal Lauener 

A Southern Lapwing bird flies past goalkeeper Cristian Vampestrini of Argentina's Arsenal Sarandi during their Copa Libertadores soccer match against Brazil's Sao Paulo, in Sao Paulo March 7, 2013. 

Sweden's Joel Sjoholm gestures towards a family of swans during the final of the International Golf Open in Pulheim near Cologne June 24, 2012. REUTERS/Ina Fassbender 

A squirrel runs on the field during the NFL football game between the Chicago Bears and Tampa Bay Buccaneers at Wembley stadium in London, October 23, 2011. REUTERS/Suzanne Plunkett 

A hare runs across the sixth green during the first round of the British Open golf championship at Royal St George's in Sandwich, southern England July 14, 2011. REUTERS/Kieran Doherty 

A fox runs across the pitch at the start of the Six Nations rugby union match between England and Scotland at Twickenham in London March 13, 2011. REUTERS/Toby Melville 

A lynx crosses the finish area during the first training run for the men's Downhill race of the Vancouver 2010 Winter Olympics in Whistler, British Columbia, February 10, 2010. REUTERS/Leonhard Foeger