North America’s Great Plains is an endless sea of grass. Stretching over 2,500 km along the middle of North America, the grasses cover around 1.3 million square kilometres. Home to a multitude of animals, the “king of the prairie” is undoubtedly the American bison. For over 10000 years, they have dominated these plains. Also known as Buffalo, they once provided a lifeline of food and clothing for early native Americans. Although no longer hunted by man, this regal ruler still faces a whole host of seasonal challenges. For bison, life on the prairie is an annual struggle.