April
1 April – International Bird Day (Birdwatcher's Day)3 April – World Aquatic Animals Day4 April – International Stray Animals Day; Beware of Mines! (International Day of Mine Risk Education and Assistance in Mine Action)5 April – Clean Karma Day7 April – Beaver Day; World Health Day6 April – Geologist's Day12 April – World Hamster Day, ‘March of the Parks’ - an annual international environmental campaign in support of nature conservation13 April – International Plant Appreciation Day15 April – Day of Environmental Knowledge in Ukraine; Bat Day16 April – Save the Elephant Day19 April – Environment Day, Snowdrop Day21 April – World Fish Migration Day22 April – World Mother Earth Day23 April – "Let's Make Ukraine Clean!"24 April – World Laboratory Animals Day25 April – World Penguin Day; International DNA Day26 April – International Chernobyl Remembrance Day; International Day of Remembrance for Victims of Radiation Accidents and Disasters (International Chernobyl Disaster Remembrance Day)27 April – Frog Rescue Day or Frog Conservation Day29 April – Day of Remembrance for All Victims of the Use of Chemical Weapons; WWF Birthday; International Guide Dog Day