The extraocular muscles must turn each eye inward; the sphincter muscles must work to make the pupil smaller; and the ciliary muscles must contract to allow the lens to change to a shape that will produce a clearer image. Solution: Focus on a distant object to immediately feel your eyes relax.
Its upper body is blue, the belly is silver, and the fins are yellowish-gray. The common amberjack can reach five to six feet (1.5 to 1.8 m) in length and more than 100 pounds (45 kg) in weight. The average weight, however, is 10 to 15 pounds (4.5 to 6.8 kg).
âArctodus weighed about 1,600 pounds to 1,900 pounds,â says Matheus. Thatâs roughly twice the weight of the average modern Alaska coastal brown bear. âOn hind legs, it stood 8 feet to 10 feet tall.â Even on all fours, Arctodus could look a 6-foot man in the eye. Itâs tempting to assume that, since this bear was such an outsized carnivore, it was the alpha predator of its time.