First Saturday of May - Green Up Day Vermont

First Full Week of May - International Compost Awareness Week 

2 - World Tuna Day

3 - Bike-to-Work Day

3 - International Leopard Day

3 - Wild Koala Day

4 - Greenery Day Japan

8 - World Donkey Day

13 - World Migratory Bird Day

Third Friday of May - Endangered Species Day

20 - World Bee Day

22 - International Day for Biological Diversity

23 - World Turtle Day

24 - European Day of Parks - Europarc Federation

27 - World Otter Day

31 - World No Tobacco Day

31 - World Parrot Day