Female praying mantises are notorious for sometimes eating their mates after or during copulation.
Cockroaches are opportunistic feeders and have been observed eating their own kind, especially when food is scarce and also helps them survive in environments where resources are limited.
Wolf spiders sometimes practice cannibalism, particularly among females, who may eat their mates after copulation.
Chimpanzees sometimes engage in cannibalism, usually in the context of intergroup conflicts, where an individual from a rival group may be killed and eaten by the victorious group.
Hyenas have been shown engaging in cannibalism, frequently targeting weak, sick, or deceased members of their own clan, particularly during times of food scarcity.
In harsh conditions where food is scarce, polar bears have been known to engage in cannibalism, particularly adult males preying on cubs or younger bears to survive.
Hamsters, particularly in stressful environments, may eat their own young. It is believed to be a survival strategy.