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The snake detection theory (SDT), [1] [2] [3] also sometimes called the snake detection hypothesis, suggests that snakes contributed to the evolution of visual systems in primates. According to the theory, predatory pressure on early primate populations from snakes selected individuals who were best able to recognize them, improving their ...
Some neurons appear to be tuned to detect movement in one direction. It has been found that the snake's visual and infrared maps of the world are overlaid in the optic tectum. This combined information is relayed via the tectum to the forebrain. [9] The nerve fibers in the pit organ are constantly firing at a very low rate.
The Scolecophidia, commonly known as blind snakes or thread snakes, [2] are an infraorder [2] of snakes. [3] They range in length from 10 to 100 centimeters (4 to 40 inches). All are fossorial (adapted for burrowing). [4] Five families and 39 genera are recognized. [5]
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Rena humilis, known commonly as the western blind snake, the western slender blind snake, and the western threadsnake, [4] is a species of snake in the family Leptotyphlopidae. The species is native to the southwestern United States and northern Mexico. Six subspecies are recognized as being valid, including the nominate subspecies described ...
L. g. getula can be quite docile even when caught wild Florida kingsnake in Dixie County, Florida. Adult specimens of the speckled kingsnake, L. g. holbrooki, are the smallest race at 91.5 cm (36.0 in) in snout-to-vent length (SVL) on average, while L. g. getula is the largest at 107 cm (42 in) SVL on average. [7]
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While many of these "stem-snakes" are known from Mesozoic fossils, some of them may be descendants of the earliest true snakes rather than more primitive lineages. Below is a cladogram modified from a study by Wilson et al. (2010), which found many stem-snakes of other studies to be true snakes instead.