Seahorses and their close relatives, sea dragons, are the only species in which the male gets pregnant and gives birth.
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.
Male seahorses not only become pregnant and give birth, but do so in ways that take different forms, which make them unique research subjects to understand the evolution of pregnancy, according to Dr Olivia Roth from the Helmholtz Centre for Ocean Research Kiel (GEOMAR) in Germany.
In seahorses and pipefish, it is the male that gets pregnant and gives birth. Seahorse fathers incubate their developing embryos in a pouch located on their tail. The pouch is the equivalent of the uterus of female mammals.
Sexual reproduction often involves evolutionary differentiation of males and females. Females typically produce significantly fewer gametes (eggs) than males and invest heavily in each one. On the other hand, males produce many gametes (sperm) and invest little into each one.
They are monogamous with one partner for their whole lives. Every day they meet in the male's territory and perform a sort of dance where they may circle each other or an object, change colour, and even hold tails.
In fact, such human-animal hybrids are often referred to as “chimeras”.
Ethical considerations preclude definitive research on the subject, but it's safe to say that human DNA has become so different from that of other animals that interbreeding would likely be impossible.
Male pregnancy is an alien concept to us mammals. Yet this phenomenon is the universal reproductive mode of pipefishes, seahorses and sea dragons (family Syngnathidae, with more than 200 species).
Until quite recently, there was no evidence for male lactation in wild mammals, but it has now been reported in two species of Old World fruit bats.
Creating offspring without sperm
Females of these species, which include some wasps, crustaceans and lizards, reproduce only through parthenogenesis and are called obligate parthenogens.
A woman who was born without a uterus gave birth to a miracle baby thanks to a groundbreaking procedure from Penn Medicine.
Yes, a male giving birth—painful contractions and all. Turns out, when it comes to seahorses, males are actually the ones that become pregnant and carry the babies.
The platypus is a remarkable mammal found only in Australia.
The platypus is a duck-billed, beaver-tailed, otter-footed, egg-laying aquatic creature native to Australia. If its appearance alone somehow fails to impress, the male of the species is also one of the world's few venomous mammals!
The only mammal that produces both milk and eggs is thus the platypus. It seems to have a duck's beak. It is an egg-laying animal that lives in a semi-aquatic environment.
The vast majority of animals need to breed to reproduce. But a small subset of animals can have offspring without mating. The process, called parthenogenesis, allows creatures from honey bees to rattlesnakes to have so-called “virgin births.”
It is theoretically possible to transplant a uterus into someone who was born male. But the body would need a lot of preparation. Gender reassignment surgery would be much more involved, for one thing. As with traditional male-to-female surgery, doctors would have to create a vaginal canal.
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.
Abstract. Among all extant mammals, only the female spotted hyena (Crocuta crocuta) mates and gives birth through the tip of a peniform clitoris.
“When we put horse sperm with eggs, they don't even try to penetrate them. They just swim happily about ignoring the egg, leaving us with a zero-fertilization rate.”
No. The cell structure is different, for different species. You would have to fertilize the egg outside of the human body. Even if it were possible, the embryo would not survive.
Answer and Explanation: No, gorillas and chimpanzees cannot mate. The two species are evolutionarily too distant and their DNA is too dissimilar for a gorilla and a chimpanzee to produce offspring.
The first successful human-animal chimeras were reported in 2003. Chinese researchers at the Shanghai Second Medical University successfully fused human cells with rabbit eggs. They were allowed to develop the eggs for several days in a petri dish before the embryos were harvested for their stem cells.
As some of the first bands of modern humans moved out of Africa, they met and mated with Neandertals about 100,000 years ago—perhaps in the fertile Nile Valley, along the coastal hills of the Middle East, or in the once-verdant Arabian Peninsula.