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In Narcisse, Around 75,000 Snakes Are Waking Up From a Nap

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"She ultimately decides when she is ready to mate by a mysterious mechanism called cryptic female choice."

That was a risky click but it turned out to be interesting science:

Female choice that occurs after copulation is detectable because not all the female's mates have equal paternity; it is called cryptic female choice because the process is hidden. For example, females may transport sperm from particular males to storage sites near where fertilization occurs, which could result in paternity biased towards those males. Cryptic female choice can have profound effects on the strength and direction of sexual selection, the evolution of mating systems, and the coevolution of female and male reproductive traits that leads to speciation. However, the cryptic nature of postcopulatory female choice has made it extremely difficult to document.

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