Through a dino's eyes."Sight for 'Saur Eyes: T. rex vision was among nature's best" (SN: 7/1/06, p. 3) makes two questionable assertions. First, Tyrannosaurus Tyrannosaurus (tīrăn'ōsôr`əs, tĭr–) [Gr.,=tyrant lizard], member of a family, Tyrannosauridae, of bipedal carnivorous saurischian dinosaurs characterized by having strong hind limbs, a muscular tail, and short rex might well have had excellent binocular vision and been a predator, but still have had a handicap for the detection of motion as my eats do. Second, when Thomas R. Holtz Jr. states that binocular vision "almost certainly was a predatory adaptation" that puts us binocular binocular, small optical instrument consisting of two similar telescopes mounted on a single frame so that separate images enter each of the viewer's eyes. As with a single telescope, distant objects appear magnified, but the binocular has the additional advantage hominids firmly among predators, while our dentition dentition, kind, number, and arrangement of the teeth of humans and other animals. During the course of evolution, teeth were derived from bony body scales similar to the placoid scales on the skin of modern sharks. firmly disputes this. HERB WINDOLF, PRESCOTT, ARIZ ARIZ Arizona (old style) . |
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