Here are 10 animals that hatch from eggs and also give birth to live young:
Viviparous animals are born through a live birth event. Ovoviviparous animals hatch from an egg retained within the mother and are born live.
Mammals: Most mammals, including humans, dogs, cats, elephants, whales, and many more, give live birth. Some Reptiles: While most reptiles lay eggs, some, certain species of snakes and lizards, give birth to live young. Some Fish: Certain species of sharks and rays give birth to live young instead of laying eggs.
Ovoviviparous animals are born live. Some examples of ovoviviparous animals are sharks, rays, snakes, fishes, and insects.
Mammals give birth to live young, are warm-blooded (can regulate their own body temperature) and are vertebrates with internal skeletons. Monotremes are mammals that lay eggs rather than bear live young.
Did you know the longest brooding period or 'pregnancy' of any known animal is a whopping four and a half years? If you think female African elephants have it tough with their 22-month gestation period, spare a thought for the deep-sea octopus Graneledone boreopacifica.
Backward-aging jellyfish
At the top of our immortal animals list is a tiny variety of jellyfish known as Turritopsis doohmii, or more commonly, the immortal jellyfish. It has found a way to cheat death by actually reversing its aging process, according to National Geographic.
Monotremes (/ˈmɒnətriːmz/) are mammals of the order Monotremata. They are the only mammals still in existence which lay eggs, rather than bearing live young. The five extant monotreme species are the platypus and the four species of echidnas.
Glass sponges are considered the oldest animals on Earth—and it's by a long shot. Scientists estimate that they can live for more than 10,000 years, possibly 15,000 years maximum. One glass sponge observed by researchers in the Ross Sea, a bay of Antarctica, is thought to be the oldest living animal on the planet.
Dolphins give birth to live young and do not lay eggs.
Aphid. Aphids, tiny insects found the world over, are “essentially born pregnant,” says Ed Spevak, curator of invertebrates at the St. Louis Zoo.
As far as we know, all dinosaurs reproduced by laying eggs, as do most other sauropsids (reptiles). It is very difficult to determine what species of dinosaur laid the eggs that have been discovered, because only a few dinosaur embryos have been found inside the fossil eggs.
Giraffes give birth standing up. The baby giraffe's head and hooves come out first, followed by the rest of the body, which then falls six feet to the ground with a crash. This rude, abrupt and dramatic entry into the world is absolutely necessary for mother and calf's survival.
It is not only mammals that give birth. Some reptiles, amphibians, fish and invertebrates carry their developing young inside them. Some of these are ovoviviparous, with the eggs being hatched inside the mother's body, and others are viviparous, with the embryo developing inside their body, as in the case of mammals.
5 Examples of Viviparous Animals
Share: In the warm seas of the Mediterranean lives a jellyfish with an extraordinarily rare ability – it can rewind its life cycle. The so-called 'immortal' jellyfish, or Turritopsis dohrnii, can somehow reprogramme the identity of its own cells, returning it to an earlier stage of life.
I have named the mayfly Dolania americana the shortest lived among the Ephemeroptera with females typically living for less than five minutes (Sweeny & Vannote 1982).
Deep-Sea Sponges
A deep-sea sponge can break the records of all living animals. It can live up to a thousand years. In fact, a study revealed that the oldest of the sponge samples collected lived for 11,000 years. During this time, the earth has just recovered from the Ice Age.
The vaquita is the most endangered cetacean in the world. With as few as around 10 left, the species will become extinct without a fully enforced gillnet ban throughout their entire habitat.
The hydrozoan Turritopsis dohrnii, an animal about 4.5 millimetres wide and tall (likely making it smaller than the nail on your little finger), can actually reverse its life cycle. It has been dubbed the immortal jellyfish.
Jellyfish and comb jellies
Turritopsis dohrnii and Turritopsis nutricula, are small (5 millimeters (0.20 in)) species of jellyfish that use transdifferentiation to replenish cells after sexual reproduction. This cycle can repeat indefinitely, potentially rendering it biologically immortal.
The Amur leopard is one of the rarest big cats in the world, with only around 100 individuals left in the wild.
Python. Pythons, the slithery creatures of the wild, are also silent killers. There will be no sound when they slowly creep up to their victims, and in a sudden move they will constrict them, killing them slowly and painfully.
Most scientists who study the topic would agree that no animal has this level of understanding, though a few species—certain great apes, elephants, and some cetaceans—have the cognitive sophistication to grasp non-functionality, irreversibility, and perhaps causality and a limited sense of universality.