Boa constrictors are fairly easy to sex from the spurs, though individuals under three feet long can be difficult. Males have fairly long spurs with a thick claw with a hook at the end. Females have shorter spurs with either a thin, unhooked claw or no claw. Female spurs are often in a pit in the skin, making them difficult to see. Probably 80% or better of boa constrictors can be sexed this way. Looking at the spurs on snakes of known sex helps, too.

Paul Hollander

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