 Thanatosis in "P. mirabilis" has been observed to significantly increase the male's odds of successfully copulating from less than 30% to 89%.Predators of "Pisaura mirabilis" includes spider wasps, tree frogs, lizards, and song birds during the day, and toads, shrew mice, and bats at night.Other spider species, as well as from the same species (cannibalism), consider "P. mirabilis" as prey.