World Wildlife Day 2021: Exploring the theme and who said what The themes of previous World Wildlife Day include "Sustaining all life on earth" (2020), "Life below water: for people and planet" (2019), "Big cats - predators under threat" (2018), and "Listen to the young voices" (2017). 0 claps 68th United Nations General Assembly proclaimed March 3 as World Wildlife Day. Since then, every year, the planet has united in spreading awareness towards the conservation of flora and fauna, making it one of the most important global events dedicated to wildlife. The day is celebrated by highlighting the pivotal role played by forests, the fauna living in them, and the entire ecosystem in sustaining the livelihoods of hundreds of millions of people globally. As per the UN, over 800 million people live in tropical forests and savannahs in developing countries.