Palolo worms, for instance, come out of the coral crevices they live in just one night a year for an orgiastic frenzy. There's no way that predators can eat all the palolo worms in a single night. If the worms mated more often, a greater proportion of them would fall victim. Same thing happens with 17-year cicadas. No predator can eat an infinite amount of food in a finite amount of time.
Timing is everything.
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