What shape do the pupils of the Western Rattlesnake take, a feature typical of nocturnal or crepuscular hunters?
Answer
Vertical and elliptical
The eyes of *Crotalus oreganus* feature vertical, elliptical pupils, which are characteristically seen in many nocturnal or crepuscular species. This pupil shape allows for maximal light intake in low-light conditions by opening widely to become nearly circular. Conversely, when exposed to bright sunlight, these pupils constrict tightly down into narrow slits to protect the sensitive internal structures of the eye. While a vertical pupil is often cited as a visual cue for venomous snakes in many regions, it is not a universally definitive identifier across all dangerous species.
Related Questions
What is the scientific cataloging name for the Western Rattlesnake?What specialized heat-sensing organs are located between the eye and the nostril of *Crotalus oreganus*?What texture characterizes the dorsal scales of the Western Rattlesnake skin?What feature on the tail is explicitly stated as not being a reliable indicator of the snake's age?What shape do the pupils of the Western Rattlesnake take, a feature typical of nocturnal or crepuscular hunters?How does the head shape of *Crotalus oreganus* differ from the neck region?What darker marking, besides the main blotches, aids in identifying *C. oreganus* when patterns are faint?What anatomical feature provides definitive confirmation of pit viper classification over Gopher snakes (*Pituophis* species)?What physical aspect of the tail tip distinguishes juveniles or non-rattling Western Rattlesnakes from many harmless colubrids?What defining trait remains relatively consistent across the diverse geographic range of *C. oreganus*, aiding identification when color fails?