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.
When fleeing from a predator, springbok do not pronk, but rather run at speeds of up to 80 km/h (50 mph). Another theory is that pronking enhances vigilance and gives the members of a herd a clear view of the surrounding countryside and its dangers. very good size of trophy horns are Â± 38cm (15 inches).Springbok males are also bigger in body with thicker necks than the females. These animals can fight fiercely with their horns-more so than most other antelope species. They often clash and lock their horns and wrestle ferocious to pull their opponents off balance.