Social Media Means
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That's because as the sharks develop their embryonic teeth, they start to eat the other embryos, killing their unborn brothers and sisters, as well as the unfertilized eggs. It's survival of the fittest in the womb, until only one shark remains.
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Read More »Ovoviviparous shark pups depend on yolk for nutrition, and when an embryo has expended its own yolk sac, it turns to the eggs around it. Some species practice intrauterine cannibalism, or eating the other fertilized or unfertilized eggs in the womb. The best-known intrauterine cannibal is the sand tiger shark. Although the sand tiger shark has two uteri and produces many eggs, each litter yields just two pups -- one from each uterus. That's because as the sharks develop their embryonic teeth, they start to eat the other embryos, killing their unborn brothers and sisters, as well as the unfertilized eggs. It's survival of the fittest in the womb, until only one shark remains. Because of their pre-birth diet, sand tiger pups enter the world bigger than other pups; they measure approximately three feet (one meter) long [source: National Aquarium]. The sand tiger's cannibalism is known as adelphophagy, which literally means "eating one's brother" [source: Martin]. But other sharks practice cannibalism as well, albeit in a slightly more subdued form known as oophagy, which is the eating of eggs that haven't been fertilized. Approximately 14 species of sharks are thought to practice some form of intrauterine cannibalism [source: Martin].
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Read More »A species of freshwater fish can impregnate itself — by growing male sex organs and then mixing sperm and eggs in its own mouth, scientists said.
These scaly swimmers are taking the expression “love thyself” a bit too far! A species of freshwater fish can impregnate itself — by growing male sex organs and then mixing sperm and eggs in its own mouth, scientists said. A team of researchers from the UK observed the rare technique — called “selfing” — during a study published in the journal Royal Society Open Science, which focused on the self-fertilization patterns of cichlid hybrid fish, a species that is often kept in aquariums as pets. In their report, the team described how the creatures were able to knock fins with themselves — and then produce healthy offspring — several times over the course of a year. The way it works is simple: after developing the male reproductive organs, the fish will ejaculate into the water and then suck up the fluid into their mouths, where a batch of eggs is waiting to be fertilized. Once the magic happens, they will then give birth to at least four, perfectly normal fish — all of which are able to reproduce normally. Selfing is relatively rare, it is known to occur elsewhere in the animal kingdom, usually due to a lack of available mates, researchers said. For the Mangrove killifish, another tropical fish species that can be found along the coasts of Florida, it’s the only way their species can survive. “In the mangrove killifish, selfing is an adaptation,” Ola Svensson, a biologist who took part in the study, told Discovery News. “It is believed that it can be hard for them to find a mate, and selfing is better than not producing at all.” Other creatures that can impregnate themselves include the New Mexico whiptail lizard and the Komodo dragon, which is also known to mate with their male offspring.
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