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Pregnant male seahorse. Male pregnancy is the incubation of one or more embryos or fetuses by organisms of the male sex in some species. Most species that reproduce by sexual reproduction are heterogamous—females producing larger gametes and males producing smaller gametes ().
Most mammals are viviparous, giving birth to live young. [1] However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. [2] In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian ...
Fishes that give birth to live young can be ovoviviparous, where the eggs are fertilized within the female and the eggs simply hatch within the female body, or in seahorses, the male carries the developing young within a pouch, and gives birth to live young. [43]
A boa constrictor in the U.K. gave birth to 14 babies — without a mate. The process is called parthenogenesis, from the Greek words for “virgin” and “birth.”
Nolwazi gave birth Aug. 16 to the first male calf born at the Chaffee Zoo, which is 95 years old, staffers said previously. It didn’t take long after being born for Amhle’s baby to be on his feet.
A male can have up to 400 eggs in his mouth at one time. The male can't feed while he hosts the young, but as the young get older, they spend more time out of the mouth. [52] This is sometimes termed mouthbrooding. During the breeding season, male three-spined sticklebacks defend nesting territories. Males attract females to spawn in their ...
In aphids, a generation sexually conceived by a male and a female produces only females. The reason for this is the non-random segregation of the sex chromosomes 'X' and 'O' during spermatogenesis. [35] Facultative parthenogenesis is often used to describe cases of spontaneous parthenogenesis in normally sexual animals. [36]
This isn't the first time that same-sex behavior has been observed by animals. Monkeys, penguins, and dolphins have been known to engage in same-sex mating too. There's so much more to learn from ...