Baby mice have been made with two mums and no dad, say researchers at the Chinese Academy of Sciences. It took a substantial feat of genetic engineering to break the rules of reproduction. The scientists said the "bimaternal" (two mammas) animals were healthy and went on to have pups of their own.
Most animals that procreate through parthenogenesis are small invertebrates such as bees, wasps, ants, and aphids, which can alternate between sexual and asexual reproduction. Parthenogenesis has been observed in more than 80 vertebrate species, about half of which are fish or lizards.
Two Female California Condors Give Birth To Chicks Without Mating. Scientists say that two female California condors each spontaneously conceived two chicks within the last 20 years with no male involved. The rare process that leads to creatures reproducing spontaneously is called parthenogenesis.
Animals that reproduce asexually include planarians, many annelid worms including polychaetes and some oligochaetes, turbellarians and sea stars.
Identical twins, although rare, do occur in other animal species, including horses, cattle, pigs, and even armadillos. In some of these species, the occurrence of identical twins often comes the concern of conjoined twins, most notably in cattle.
Naturally, twins occur in about one in 250 pregnancies, triplets in about one in 10,000 pregnancies, and quadruplets in about one in 700,000 pregnancies. The main factor that increases your chances of having a multiple pregnancy is the use of infertility treatment, but there are other factors.
EUROPEAN RABBIT: 360
An eye-watering number of young, but rabbits need to have lots of babies as only 15 per cent make it through the first year.
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. The new embryo formed at the end of pregnancy develops in the second, 'unused' uterus.
Many species of fish, like the kobudai, are known as “sequential hermaphrodites”: they can switch sex permanently at a specific point in their lives. The majority of “sequential hermaphrodites” are known as “protogynous” (Greek for “female first”): they switch from female to male.
We're sure some of these are bound to surprise you! Beavers are one of the few mammals that mate for a lifetime, only choosing to find another mate if their original mate dies. But here's where it gets interesting: there are two types of beavers, European beavers and North American beavers.
The San Diego Zoo Wildlife Alliance on Thursday announced two California condors in the organization's breeding program successfully hatched eggs without the participation of a male. The process has been observed in bird species before, although it is rare and generally occurs in females who have no access to mates.
Two baby birds were born in California without any help from males—that is, they were each produced by a female bird alone. The San Diego Zoo Wildlife Alliance released a report Thursday detailing the discovery, which reveals that condors, a critically endangered species of bird, are able to asexually reproduce.
While eagles, hawks, and other raptors can attack small children, there are only a handful of stories where they do—and they date back over two hundred years. But while it's still rare that a bird will attack or carry away a child, the National Audubon Society does concede that bird attacks in general are on the rise.
This is because dogs and people have very different sets of instructions in their DNA. Their genomes are simply too different to come together and make something that will live. Their genomes cannot mix in any productive way.
Pregnancy without sperm — is it possible? Although you can get pregnant without having sexual intercourse, pregnancy without sperm is impossible. Without intercourse, you can get pregnant with the help of different fertility treatments and procedures such as IVF, IUI, and at-home insemination.
Worms. Some (not all) species of worms reproduce by an asexual process called fragmentation. They have no assigned gender, meaning they have both male and female reproductive parts and can reproduce sexually as either gender, or just break apart and each fragment can become a new worm.
Based on the sole criterion of production of reproductive cells, there are two and only two sexes: the female sex, capable of producing large gametes (ovules), and the male sex, which produces small gametes (spermatozoa).
Tetrahymena are oval-shaped protozoa that live in freshwater. These microscopic organisms come in seven different "sexes," or mating types. Any Tetrahymena sex can mate with any other mating type except its own. Even more intriguing to biologists is that it doesn't matter what mating types two Tetrahymena parents are.
Share: Elephants have the longest pregnancy period of any living mammal.
Seahorse fathers break all the rules—they're the onces who get pregnant and give birth. After the seahorse mother deposits her eggs into the father's pouch, the father fertilizes the eggs and incubates them until he gives birth to the tiny, fully-formed seahorses. This happens after about 20 to 28 days of pregnancy.
Seahorses and their close relatives, sea dragons, are the only species in which the male gets pregnant and gives birth. Male seahorses and sea dragons get pregnant and bear young—a unique adaptation in the animal kingdom.
The birth of nine children is an extremely rare phenomenon. Only two others were recorded so far, in Australia in 1971 and in Malaysia in 1999. But Cissé's is the the first example of nonuplets born alive.
A California woman gave birth to eight babies Monday. This is only the second time recorded in the U.S. that a woman has given birth to live octuplets. Slate.com's Christopher Beam breaks down the science of the rare event.
Squirrel monkey infants have such large heads compared to the size of their mothers' pelvises that they face a very high rate of birth complications. Perhaps the most horrifying birth is that of the spotted hyena.
The Czech Republic birth data revealed that quintuplets are born once every 480 years! Hence this is an exceptionally great birth and all the kids and the mum are healthy!