Grab your flippers—it"s World Dolphin Day, a day to celebrate and promote the conservation of these aquatic mammals. Dolphins are highly intelligent and can be found all over the world in oceans, rivers, and estuaries. But they are threatened by human activities, such as hunting, pollution, and fishing. Hunting in particular led to the creation of World Dolphin Day in 2022 by Sea Shepherd Global, an international marine conservation group.