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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 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 ...
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Experiments on European robins, which are migratory, suggest their magnetic sense makes use of the quantum radical pair mechanism.. Magnetoreception is a sense which allows an organism to detect the Earth's magnetic field.
Since researchers put their remote camera online in May, several snakes have become known in a chatroom and to scientists by names including “Woodstock,” “Thea” and “Agent 008.”
Vision is not the most important requirement in terrestrial gastropods, because they are mainly nocturnal animals. [1] Some gastropods, for example the freshwater apple snails (family Ampullariidae) [7] and marine species of genus Strombus [8] can completely regenerate their eyes. The gastropods in both of these families have lens eyes.
Cephalopods, as active marine predators, possess sensory organs specialized for use in aquatic conditions. [1] They have a camera-type eye which consists of an iris, a circular lens, vitreous cavity (eye gel), pigment cells, and photoreceptor cells that translate light from the light-sensitive retina into nerve signals which travel along the optic nerve to the brain. [2]
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