Chооse the sentence thаt best expresses the implied mаin ideа оf the paragraph below. In species such as the red-back spider, the black widow spider, the praying mantis, and the scorpion, the female commonly eats the male after mating. Another widespread form of cannibalism is size-structured cannibalism, in which large individuals consume smaller ones. Octopus, bats, toads, fish, monitor lizards, salamanders, crocodiles, spiders, crustaceans, birds, mammals, and a vast number of insects have all been observed to engage in size-structured cannibalism. Yet another common form of cannibalism is infanticide. Classic examples include the chimpanzees, where groups of adult males have been observed to attack and consume their infants; and lions, where adult males commonly kill infants when they take over a new harem after replacing the previous dominant males. Also, gerbils and hamsters eat their young if they are stillborn, or if the mothers are especially stressed.