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Manatees (/ ˈ m æ n ə t iː z /, family Trichechidae, genus Trichechus) are large, fully aquatic, mostly herbivorous marine mammals sometimes known as sea cows.There are three accepted living species of Trichechidae, representing three of the four living species in the order Sirenia: the Amazonian manatee (Trichechus inunguis), the West Indian manatee (Trichechus manatus), and the West ...
Because manatees feed on abrasive plants, their molars are often worn down and are replaced many times throughout their lives, thus earning the nickname "marching molars." The molar teeth are similar in shape, but of varying sizes. Manatees do not have incisors; these have been replaced by horny gingival plates. [50]
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Some female African manatees are sexually mature as young as 3 years of age, and they give birth every 3 to 5 years of their estimated 30-year lifespan. Males take a longer time to mature (about 9 to 10 years) and can rarely fertilize an egg at the age of 2 or 3 years.
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The teen remained swimming in the lake while all her friends were already on the boat and they were watching in shock when they saw their friend freaking out. Girl freaks out when a manatee ...
Ariidae males carry a clutch of a few dozen eggs in their mouths, [2] for about two months before they hatch. Luciocephalus pulcher; Jawfishes; Osteoglossid are all mouthbrooders. The parents can hold hundreds of eggs in their mouths. Once hatched, the young may make several trips outside the parent's mouth before deciding to leave permanently.
Altricial birds are less able to contribute nutrients in the pre-natal stage; their eggs are smaller and their young are still in need of much attention and protection from predators. This may be related to r/K selection; however, this association fails in some cases. [18] In birds, altricial young usually grow faster than precocial young.