Vulnerable spadefoot tadpoles eat their smaller competitors to speed towards toadhood as quickly as possible. Gulls and pelicans are among bird species that eat hatchlings for food or to prevent the spread of disease. In insect species such as the praying mantis or the Australian redback spider, males offer their bodies as a final gift to females after mating.
Click here for original story, Cannibalism is common in the animal kingdom, but for humans it’s the ultimate taboo
Source: Phys.org