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The facial pit underwent parallel evolution in pitvipers and some boas and pythons.It evolved once in pitvipers and multiple times in boas and pythons. [6] The electrophysiology of the structure is similar between the two lineages, but they differ in gross structural anatomy.
Hypsiglena unaocularus, commonly known as the Islas Revillagigedo night snake or Clarión night snake, is a species of small colubrid snake endemic to Clarion Island, initially described from a single specimen collected by William Beebe in 1936. During the next several decades, scientists were unable to detect any trace of the snake in their ...
Generally, vision is best in tree-dwelling snakes and weakest in burrowing snakes. Some have binocular vision, where both eyes are capable of focusing on the same point, an example of this being the Asian vine snake. Most snakes focus by moving the lens back and forth in relation to the retina. Diurnal snakes have round pupils and many ...
Hypsiglena is a genus of small, rear-fanged snakes, commonly referred to as night snakes, in the subfamily Dipsadinae of the family Colubridae. The genus consists of nine species . Three of these species have subspecies , which have been maintained pending further investigation.
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The pupil of the eye dilates in the dark to enhance night vision. Shown here is a pupil of an adult naturally dilated to 9 mm in diameter in mesopic light levels. The average human eye is not able to dilate to this extent without the use of mydriatics. Nocturnal mammals have rods with unique properties that make enhanced night vision possible.
Finding just a snake skin, a really big snake skin. When the temperatures begin to drop, snakes go into a state called brumation . This event acts as a type of hibernation for cold-blooded animals.
Aug. 1—Though it might send a shiver down the spine of those suffering from ophidiophobia, rattlesnakes — even though they lack spines — are a lot like people. First and foremost ...