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.
A pleasure show horse can go as slow as 2 mph. Gaited horses-- who do not trot-- can do a 'running walk' as fast as 15 mph. Trot: The trot is roughly 8-10 MPH. Again, a shorter striding horse could trot slower, and a horse with a long stride could move faster. Canter/Lope: 10-17 MPH. Gallop: This depends on the horse's condition and athletic ability.