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Llamas have an unusual reproductive cycle for a large animal. Female llamas are induced ovulators. [24] Through mating, the female releases an egg and is often fertilized on the first attempt. Female llamas do not go into estrus ("heat"). [25] Like humans, llama males and females mature sexually at different rates.
The egg cell is generally asymmetric, having an animal pole (future ectoderm). It is covered with protective envelopes, with different layers. The first envelope – the one in contact with the membrane of the egg – is made of glycoproteins and is known as the vitelline membrane (zona pellucida in mammals).
Induced ovulation occurs in some animal species that do not ovulate cyclically or spontaneously. [ 1 ] [ 2 ] Ovulation can be induced by externally-derived stimuli during or before mating , such as sperm , pheromones , or mechanical stimulation during copulation .
Goat kids will stay with their mother until they are weaned. 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]
The egg is not retained in the body for most of the period of development of the embryo within the egg, which is the main distinction between oviparity and ovoviviparity. [1] Oviparity occurs in all birds, most reptiles, some fishes, and most arthropods. Among mammals, monotremes (four species of echidna, and the platypus) are uniquely oviparous.
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Protists are a large group of diverse eukaryotic microorganisms, mainly unicellular animals and plants, that do not form tissues. [8] The earliest eukaryotes were likely protists. Mating and sexual reproduction are widespread among extant eukaryotes including protists such as Paramecium and Chlamydomonas.
This nest was 111 eggs. YouTube screengrab. Brandon Rahe, a contractor with the FWC’s Python Action Team, needed a boat to reach the nest, which was well hidden in a hallow of dead grass and weeds.