Seahorses and their close relatives,
The swamp wallaby is the only mammal that is permanently pregnant throughout its life according to new research about the reproductive habits of marsupials. Unlike humans, kangaroos and wallabies have two uteri.
No baby is born in such circumstances. It is impossible for one species to impregnate a member of another species. Good thing too, or we'd have alligators breeding with elephants.
Kangaroo females get pregnant in the regular way. They shed an egg from their ovary and it drifts down the fallopian tube where, if it meets up with sperm, the egg is fertilized and then embeds itself in the wall of it's mother's uterus.
Watch: Tourists In US Get To Witness Whale Giving Birth In Rare, Once-In-A-Lifetime Event.
Also knows as Platypus frogs, the female amphibian, after external fertilization by the male, would swallow its eggs, brood its young in its stomach and gave birth through its mouth.
Hatchling Komodo dragons climb a tree in Komodo National Park, Indonesia. Komodo dragons are one of the few vertebrates that can have “virgin births,” made possible by parthenogenesis.
Elephants have the longest pregnancy period of any living mammal. If you – or someone you know – has experienced a pregnancy that seemed to go on forever, spare a thought for the elephant. It's the animal with one of the longest gestation periods of all living mammals: nearly two years.
The spiny dogfish shark can carry young for about two years, while basking sharks can do so for as long as three years. The frilled shark can wait 3.5 years before giving birth.
All you need to know about lion cubs
Pregnancy lasts for around 110 to 120 days. Eventually, when it is time to give birth, lionesses leave their family pride to find a private den in the shelter of bushes, or even a cave.
But creating hybrids of animals that are very genetically distinct from each other—such as a dog and a cat—is scientifically impossible, as is one species giving birth to an entirely different one.
In fact, such human-animal hybrids are often referred to as “chimeras”.
If you inject animal DNA in your blood, your body will reject it and nothing will happen. It will not be incorporated into your DNA. For you to become part animal or for your children to become part animal your DNA has be to be able to make functional proteins. Injecting animal DNA in your blood won't do that.
Sheep, goats, and deer all regularly give birth to fraternal twins, Long said. But what about identical twins? These genetically identical siblings form when a single fertilized egg splits in two.
The platypus (Ornithorhynchus anatinus) has a puzzling array of features. Not only does it have that iconic duck bill, it lays eggs like a bird or reptile but feeds milk to its young like a mammal.
Slugs, starfish, and other creatures also switch gender when it works to their advantage. However, the cues that trigger the change vary from species to species.
The shortest known gestation is that of the Virginian opossum, about 12 days, and the longest that of the Indian elephant, about 22 months. In the course of evolution the duration of gestation has become adapted to the needs of the species.
James Elgin Gill was born in Ottawa, Ontario, on May 20, 1987, around 128 days early or 21 weeks gestation. He set a record when he was born for the world's most premature baby.
Meet the Record- Breaking Nonuplets.
Once they are mature, sharks will usually mate in the spring and summer. The period of gestation can be anything from 9 months to 2 years ( frilled shark gestation period may be as long as 3.5 years). Most species have an average gestation period of 9-12 months.
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.
All mammals give birth to young ones, except platypus and echidna as they are egg-laying mammals. Lizards, on the other hand, are oviparous i.e., they lay eggs and they don't give birth to young ones.
Animals that reproduce asexually include planarians, many annelid worms including polychaetes and some oligochaetes, turbellarians and sea stars. Many fungi and plants reproduce asexually. Some plants have specialized structures for reproduction via fragmentation, such as gemmae in liverworts.
Pet owners are usually extremely concerned about any kind of sexual or so-called behaviours that they observe in their pets. Asexuality is the reference status for an animal that is supposed to be a kind of living toy and the vet will be immediately called in case of anything that could look like sexual behaviour.