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Ovoviviparous animals are those animals that are similar to viviparous species in which there is internal fertilization and the young are born alive, but differ in that there is no placental connection and the unborn young are nourished by egg; the mother's body does provide gas exchange. [citation needed]
The traditional modes of reproduction include oviparity, taken to be the ancestral condition, traditionally where either unfertilised oocytes or fertilised eggs are spawned, and viviparity traditionally including any mechanism where young are born live, or where the development of the young is supported by either parent in or on any part of their body.
An infant marsupial is born in a very immature state. [14] The gestation period is usually shorter than the intervals between oestrus periods. The first sign that a birth is imminent is the mother cleaning out her pouch. When it is born, the infant is pink, blind, furless and a few centimetres long.
Chimeras are animals which contain groups of cells from two or more organisms with distinct types of DNA. ... Of the six, one baby monkey was born alive and managed to survive for 10 days.
The research could lead to scientists being able to grow human organs inside animals for transplants, supporters say. Pig-monkey hybrids are born alive in China in world first Skip to main content
Greenland sharks are born alive (a process known as ovoviviparity) after an estimated gestation period of 8–18 years. [49] Estimates of litter size have varied across studies. Some studies suggest that this species produce up to 10 pups per litter, each initially measuring some 38–42 cm in length. [50]
The baby born April 13 is a Bornean orangutan, a species that lives in the wild in Southeast Asia. She weighed 3.4 pounds when mom Luna gave birth to her via cesarean section.
Animals, including mammals, produce gametes (sperm and egg) through meiosis in gonads (testicles in males and ovaries in females). Sperm are produced by the process of spermatogenesis and eggs are produced by oogenesis. These processes are outlined in the article gametogenesis.