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  2. Estrous cycle - Wikipedia

    en.wikipedia.org/wiki/Estrous_cycle

    Ovulation occurs 24–48 hours after the luteinizing hormone peak, which occurs around the fourth day of estrus; therefore, this is the best time to begin breeding. Proestrus bleeding in dogs is common and is believed to be caused by diapedesis of red blood cells from the blood vessels due to the increase of the estradiol-17β hormone .

  3. Invagination - Wikipedia

    en.wikipedia.org/wiki/Invagination

    Apical constriction is an active process that results in the shrinkage of the apical side of the cell. This causes the cell shape to change from a column or cube-shaped cell to become wedge-shaped. Apical constriction is powered by the activity of the proteins actin and myosin interacting in a complex network known as the actin-myosin ...

  4. Apical constriction - Wikipedia

    en.wikipedia.org/wiki/Apical_constriction

    Apical constriction mechanisms (red: filamentous actin. orange: myosin.) Apical constriction occurs primarily through the contraction of cytoskeletal elements. The specific mechanism depends on the species, the cell type, and the morphogenetic movement. Model organisms that have been studied include the frog Xenopus, and the fly Drosophila.

  5. Rut (mammalian reproduction) - Wikipedia

    en.wikipedia.org/wiki/Rut_(mammalian_reproduction)

    During the rut (known as the rutting period and in domestic sheep management as tupping), males often rub their antlers or horns on trees or shrubs, fight with each other, wallow in mud or dust, self-anoint, and herd estrus females together. These displays make the male conspicuous and aid in mate selection.

  6. Nesting instinct - Wikipedia

    en.wikipedia.org/wiki/Nesting_instinct

    The cessation of the nest building is correlated with a rise in oxytocin which is the hormone responsible for the contraction of the uterus. Shortly after this, parturition will commence. [6] In rabbits, nest building occurs towards the last third of pregnancy. The mother digs and builds a nest of straw and grass, which she lines with hair ...

  7. 10 animal mothers that make the ultimate sacrifice - AOL

    www.aol.com/news/2016-05-05-10-animal-mothers...

    Some animals starve to death shortly after birthing their young while others are eaten by their own young -- but these mothers make the ultimate sacrifice. Click through for 10 animal mothers that ...

  8. Ferguson reflex - Wikipedia

    en.wikipedia.org/wiki/Ferguson_reflex

    Michel Odent had observed that women can experience such a reflex, characterized by a birth after a short series of irresistible and powerful contractions without any room for voluntary movements, resulting in a painless birth. For such a hormonal cascade to occur requires sufficient psychological safety, as occurs in normal or undisturbed birth.

  9. Animal sexual behaviour - Wikipedia

    en.wikipedia.org/wiki/Animal_sexual_behaviour

    When animal sexual behaviour is reproductively motivated, it is often termed mating or copulation; for most non-human mammals, mating and copulation occur at oestrus (the most fertile period in the mammalian female's reproductive cycle), which increases the chances of successful impregnation.