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Llama Conservation status Domesticated Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Artiodactyla Family: Camelidae Genus: Lama Species: L. glama Binomial name Lama glama (Linnaeus, 1758) Domestic llama and alpaca range Synonyms Camelus glama Linnaeus, 1758 The llama (Lama glama) is a domesticated South American camelid, widely used as a ...
Oviparous animals laying eggs with thick calcium shells, such as chickens, or thick leathery shells generally reproduce via internal fertilisation so that the sperm fertilises the egg without having to pass through the thick, protective, tertiary layer of the egg. Ovoviviparous and viviparous animals also use internal fertilisation.
External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. [1] It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
An Alpine chough in flight at 3,900 m (12,800 ft). Organisms can live at high altitude, either on land, in water, or while flying.Decreased oxygen availability and decreased temperature make life at such altitudes challenging, though many species have been successfully adapted via considerable physiological changes.
Some species such as Pacific salmon migrate to reproduce; every year, they swim upstream to mate and then return to the ocean. [8] Temperature is a driving factor of migration that is dependent on the time of year. Many species, especially birds, migrate to warmer locations during the winter to escape poor environmental conditions. [9]
Thrips can survive the winter as adults or through egg or pupal diapause. [ 14 ] Thrips are haplodiploid with haploid males (from unfertilised eggs, as in Hymenoptera ) and diploid females capable of parthenogenesis (reproducing without fertilisation), many species using arrhenotoky , a few using thelytoky . [ 80 ]
[14] [15] Their eggs (of which each female eel produces between 1 and 20 million) are fertilized in an unknown manner, but probably in deep tropical water. [16] The mature eels then die, their eggs floating to the surface to hatch into very flat leaf-like larvae (called leptocephalus ) that then drift along large oceanic currents back to New ...
The few animals that do not return to their natal region and stray to other places to reproduce will provide the species with a variety of different locations of reproduction, so if the original natal locations have changed, the species will have expanded to more places and will ultimately increase the species' survival chances. [3]