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Like other reptiles, rattlesnakes are âcold-bloodedâ or ectothermic, relying essentially on outside heat sources rather than an internal metabolism to maintain their body temperature. They typically function most effectively at temperatures between about 70 and 90 degrees Fahrenheit (21 to 32 degrees Celsius).
Testicles might be outside the body because temperature influences the sex of human children. A temperature-sensitive gender switch that makes hot sperm male could be a relic from our evolutionary past, argue John McLachlan and Helen Storey, citing evidence that more males are born in hot climates.Temperature determines sex in many reptiles.For example, alligators that develop at or below 30 ÂºC turn out to be female, whereas hotter eggs yield males. Such a system wouldn't work in mammals: they maintain a constant body temperature and carry their young within.or example, it might be just as easy to move the temperature switch to a hotter point as to avoid it by moving testicles outside the body. But the idea that the sex switch is still there is testable, argues McLachlan.