A Malaysian man looks for river shells called "etok" in a river ahead of the country's 14th general election in Pekan, Pahang on April 27, 2018.

Trees in full bloom are pictured in a field near Senarclens, Switzerland, on April 24, 2018.

A man uses a paddle board on the bay of Boracay, the Philippines, on April 24, 2018.

Children escort goats while walking over cracked soil at a dried up rice field in Baliuag town, Bulacan province, north of Manila, Philippines.

A policeman fires teargas as he sits on the back of a pick-up vehicle during an opposition demonstration in Antananarivo, Madagascar, on April 21, 2018.

South Korea's Air Force Black Eagles aerobatic team create a yin and yang symbol used in South Korea’s national flag during a taekwondo demonstration event at the National Assembly, in Seoul, South Korea, on April 21, 2018.

Wild bluebells, which bloom around mid-April, turning the forest completely blue, form a carpet in the Hallerbos, also known as the 'Blue Forest,' near the Belgian city of Halle, Belgium, on April 20, 2018.

Activists of the environmental organization Greenpeace demonstrate next to a sun-shaped banner.

A man pedals a tricycle loaded with empty cooking oil containers in Kolkata, India, April 17, 2018.

A Sri Lankan Buddhist monk blesses an elephant at a zoo in Dehiwala on the outskirts of Colombo on April 16, 2018, as part of traditional New Year rituals.