Meet the grumpiest world-record holders in the sky! Discover how the Rüppell's vulture reached a staggering 37,100 feet—and the tragic encounter that proved it.
Meet the bird that can fly at 36,000 feet! From its 'gut-of-iron' to its unique oxygen-moving blood, discover the incredible Rüppell's griffon vulture and the German explorer who gave it its name.