Jaarlijks wordt er op Wereldproefdierendag, 24 april, stil gestaan bij de vele dieren die in laboratoria zijn overleden.

April 25th is World Penguin Day. This celebratory day coincides with the annual northern migration of Adelie penguins.

World Tapir Day is celebrated on 27 April each year and exists to raise awareness about the species of tapir that inhabit Central and South America and Southeast Asia and to raise funds to purchase land to protect it from human encroachment.

Amphibian Week was started in 2020 by the Partners in Amphibian and Reptile Conservation (PARC) and partners to increase awareness about amphibians and to celebrate all things amphibian, it is celebrated annually the first full week of May.

World Bee Day is celebrated on 20 May, on this day Anton Janša, the pioneer of beekeeping, was baptized in 1734.

The purpose of World Turtle Day, May 23, sponsored yearly since 2000 by American Tortoise Rescue, is to bring attention to,

World Otter Day takes place on the last Wednesday in May each year. The day was established by IOSF to help draw attention to otters, celebrate them, and raise awareness and support for their conservation globally.