Rattlesnake Personality Shapes Venom Delivered in Bites

Loma Linda University researchers linked individual rattlesnake temperament to the amount of venom injected during bites.

Updated on Nov. 5, 2026 in Reptiles

Screen-print poster illustration of a coiled rattlesnake rattle beside a clear glass beaker of pale amber liquid on a warm cream background. — Loma Linda University researchers found that individual rattlesnake temperament, not just size or age, determines how much venom a bite injects. AI Illustration. Upload story photo >

Researchers at Loma Linda University found that rattlesnake personality influences how much venom a snake injects when it bites. The team also found that baby rattlesnake bites are not more dangerous or deadly than adult bites.

Why it matters

The findings suggest that individual temperament, not only size or age, helps determine how much venom a bite delivers. For Californians who live near or encounter rattlesnakes, the results add to understanding of how dangerous a bite may be.

The study involved 48 Southern Pacific rattlesnakes, with three venom extractions per snake spaced two weeks apart. Researchers have not yet determined how environmental factors shape venom delivery.

The players

Loma Linda University

A private research university in Loma Linda, California, whose researchers conducted the rattlesnake venom study.

The details

Researchers extracted venom by pressing on the snake's cheeks while it bit into a membrane-covered beaker, with bites occurring voluntarily. Timid rattlesnakes consistently delivered small amounts of venom, while defensive rattlesnakes delivered larger amounts across all three trials.

Venom extractions were spaced two weeks apart across the study.
The Loma Linda team recently published its baby rattlesnake venom findings.
The team plans to study environmental factors in greater detail down the line.

Culture Shift

The study extends Loma Linda University's rattlesnake venom research by testing whether individual temperament, rather than age, explains differences in venom delivery. Rattlesnakes on Santa Catalina Island remain more defensive than mainland Southern California snakes, a difference researchers link to livestock introduced to the island and later removed.

Californians who hike, live near open land, or keep pets outdoors may find the temperament findings useful for judging rattlesnake encounter risk. The research does not show that baby snake bites are less serious, so caution around any rattlesnake remains important.

The takeaway

Individual rattlesnake temperament appears to influence how much venom a bite delivers, and baby snake bites are not more dangerous than adult bites. Treat every rattlesnake with caution regardless of its size.