Although sharks are fish, their reproductive methods are different from those of many fish, because the fertilized eggs of many sharks breed small sharks in their stomachs, and then are produced by female sharks. Sharks can carry more than one pup per litter, and they can kill each other in the mother's stomach. Especially for some sharks whose nature is more ferocious, this phenomenon is more common.
For example, there is a fierce shark called "sand tiger shark", which is a very fierce species among shark species. Female sand tiger sharks generally have two wombs, and each uterus can generally conceive 2-4 sharks during pregnancy. When the baby shark is in the mother's stomach, it has already developed teeth, at this time they will kill each other, may eat their brothers and sisters, may be eaten. This is the result of natural selection in the process of shark evolution, which can make the baby shark the strongest. However, this will also lead to fewer and fewer sharks, such as the sand tiger shark described above.
Sharks contain more species, some of which are very large in size and very ferocious in character. These sharks not only prey on a variety of marine life around them, but also may eat their own kind. If these ferocious sharks are attracted by the blood of their own kind, they may also eat their own kind. In addition, they may encounter the corpses of their own kind, at which time they will also eat the corpses.
