Worldwide, too little iodine in the diet is the most common cause of hypothyroidism. In countries with enough iodine in the diet, the most common cause of hypothyroidism is the autoimmune condition Hashimoto's thyroiditis.
The pronghorn is the second fastest land mammal in the world, after the cheetah. It can attain speeds of over 53 miles (86 kilometers) per hour. Size relative to a 6-ft (2-m) man: Fleet-footed pronghorns are among the speediest animals in North America. They can run at more than 53 miles (86 kilometers) an hour, leaving pursuing coyotes and bobcats in the dust.
The gallop averages 40 to 48 kilometres per hour (25 to 30 mph). The world record for a horse galloping over a short, sprint distance is 88 kilometres per hour (55 mph). Besides these basic gaits, some horses perform a two-beat pace, instead of the trot. In addition, there are several four-beat âamblingâ gaits that are approximately the speed of a trot or pace, though smoother to ride. These include the lateral slow gait, rack, running walk, and toelt tÃ¶lt as well as the diagonal fox. trot