When the male is alive, it will affect mating. So it should eat the male before laying eggs. In addition, it also has the function of absorbing necessary nutrients and preventing males from attacking eggs.

Sexual cannibalism refers to the phenomenon that some animals will eat their spouses after mating. Before and after mating, even during mating, females will eat mating males. In nature, there are far more females than males who eat the same kind.

In arachnids and insects, females will eat the males they mate with before, after and even during mating. Besides mantis, many spiders, chironomids and sea slugs also have the special habit that females eat males. Some people think that cannibalism is due to various complex evolutionary reasons, including species cost performance, sperm competition and mysterious male and female elimination plan. But after research, it is found that the motive of this creepy cannibalism is very simple.