Many snake species have ritualised combat during breeding season. Happens between the males. One group of snakes this is common with are rattlers. Hence why males tend to be bigger, to aid in the sparring. The bigger male wins. Only exception to this rule is the Sidewinder (Crotalus cerastes). With them, the females tend to be bigger. Might be because they don't combat. Or the pressure to have more/bigger babies is higher over selecting a large male to breed.
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Vanan
The Herp Room
"The day I tried to live, I wallowed in the blood and mud with all the other pigs" - C. Cornell
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