A man smokes as he waits with his painted buffalo before a buffalo body-painting competition in Yunnan province, China, on May 18.
Baby pygmy hippopotamus Lani eats with mother Ashaki at the Basel Zoo in Basel, Switzerland, on May 17.
A horse is seen past a red awning on a sloppy track as rain falls at Pimlico Race Course in Baltimore on May 16.
A swan just a few days old picks up a plant in Fischbach, Germany, on May 16.
A detail view of a horse two days prior to the 139th Preakness Stakes at Pimlico Race Course in Baltimore on May 15.
A view of a young Komodo dragon named Ivan, one of two male Komodo dragons at the Bioparco zoo in Rome, on May 15.
A newly born European flamingo chick is seen at the Oji Zoo in Kobe, Japan, on May 15.
Ducklings swim in the water in a garden in Sieversdorf, Germany, on May 14.
Siberian tiger cubs are seen playing in their enclosure in Hangzhou zoo in Hangzhou, east China's Zhejiang province, on May 13.
White lion cubs are seen playing with each other in their enclosure in Hangzhou zoo in Hangzhou, east China's Zhejiang province, on May 13.
An American white pelican displays the bump on the top of his beak at Flamingo Gardens in Davie, Fla., on May 13. The bump shows the bird wants to mate; it will disappear after breeding season.
Polar bear Lale plays with a ball in a pool of her enclosure at the zoo in Bremerhaven, Germany, on May 13.
A three-week-old potbellied pig tries climb a stair in its enclosure at the Tierpark in Berlin on May 13.
A crow takes flight off a fence along a row of newly-constructed homes in Sydney, Australia, on May 13.
A handout picture released by the Boudewijn Seapark Animal Park shows newborn baby seal in Bruges, Belgium, on on May 12.
Brown bears are seen inside an enclosure at "Libearty" Zarnesti bear sanctuary in Romania on May 14.