April1 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

May3 May – Sunshine Day10 May – World Cactus Day11 May – World Migratory Bird Day12 May – Environmental Education Day15 May – International Climate Protection Day16 May – Day of Love for Trees, Endangered Species Day17 May – Science Day in Ukraine18 May – International Plant Day20 May – World Bee Day, European Sea Day21 May – European Natura 2000 Day

June1 June – Land Reclamation Day; Day of Water Management Workers of Ukraine5 June – World Environment Day; Arbor Day in New Zealand; Earth Day (date for 2025. It is calculated by the Global Footprint Network think tank)6 June – International Day for the Purification of Water8 June – World Oceans Day 15 June – World Wind Day (Global Wind Day) 16 June – World Sea Turtle Day (held under the auspices of the world's leading independent conservation organisation WWF)17 June – World Day to Combat Desertification and Drought 21 June – Summer Solstice Day; National Aboriginal Day in Canada; World Giraffe Day (unique spots and important mission)22 June – World Rainforest Day27 June – International Fisheries Day; World Microbiome Day29 June – International Day of the Tropics