The International Union for Conservation of Nature (IUCN) is like a big club where lots of people from different countries come together to help take care of plants, animals, and the environment.
They work very hard to make sure that things in nature don't disappear forever. They also make sure that people can use nature in a way that doesn't hurt the plants or animals.
They have different people in their club who do different things, like scientists who study animals and plants, people who work with governments to make policies to protect the environment, and people who help organizations in different countries work together to save different parts of nature.
Everyone in the IUCN is like a superhero working together to save the planet!