Red stag deer, also known as red deer, are among the largest deer species in the world. Native to Europe, Asia, and North Africa, they have also been introduced to regions such as New Zealand, Australia, and the United States. Male stags are known for their impressive antlers, which are shed and regrown each year and can reach remarkable size.

Red stags are herbivores that feed on grasses, leaves, and twigs, and they typically live in social herds. During the fall mating season, males compete for mates through roaring, displays, and physical contests.