When it comes to cuteness, it’s all subjective. Depending on the species, baby sharks can be as small as palm-sized infants like small spotted cat sharks that hatch from “mermaid's purse” egg cases or directly from their mothers as long-bodied pups with outstretched arms.
This is especially true for sand tiger sharks, although it’s surprising how these tiny creatures grow so big. Sand tiger sharks are one of the many species where fertilized eggs hatch inside the female’s body and develop in the womb.
It’s quite common for shark fetuses to feed on unfertilized eggs, a behavior seen in over a dozen species. Sandwich shark embryos are even more developed, with ultrasound scans showing them swimming between the uterus prongs, likely searching for more sustenance.
After a year of gestation, female sand tiger sharks give birth to one or two large pups, considered the survivors of a fierce intrauterine battle. While their size at birth helps protect them from many predators, they are also at risk of getting caught in fishing nets, pushing them closer to extinction.
Researchers studied shark carcasses caught in nets across South Africa to understand why unborn sand tiger sharks engage in cannibalism. They found that females carrying more advanced embryos produced fewer fetuses due to intrauterine competition.
DNA testing revealed that sand tiger shark fetuses are born to multiple fathers in a litter, showing a complex mating system where the offspring of one dominant male tend to outcompete their half-siblings.
It’s unclear why this occurs, but it could be a strategy for females to select the best mate or for the strongest sperm to produce the most viable offspring. This article dives into the intriguing world of baby sharks and their complex familial relationships.
This article addresses questions like: “How cute are baby sharks in real life?” – Jacob Barnett, Peterborough
For inquiries, contact us at: questions@sciencefocus.com or message us on Facebook, Twitter, or Instagram (remember to include your name and location).
Explore more fun facts and fascinating science topics on our ultimate science pages.
Read more:
Source: www.sciencefocus.com
