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 is the fastest gait of the horse, averaging about 40 to 48 kilometres per hour (25 to 30 mph). The speed of the canter varies between 16 and 27 kilometres per hour (10 and 17 mph) depending on the length of the stride of the horse. A variation of the canter, seen in western riding, is called a lope, and generally is quite slow, no more than 13â19 kilometres per hour (8â12 mph).