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The manatee's tail is paddle-shaped, and is the clearest visible difference between manatees and dugongs; a dugong tail is fluked, similar in shape to that of a whale. The manatee is unusual among mammals in having just six cervical vertebrae, [12] a number that may be due to mutations in the homeotic genes. [13]
Female African manatees give birth to one calf at a time after about a 13-month pregnancy. Calves can swim on their own at birth. Although the African manatee's social organization is not well understood, research shows the most common and tightly knit bonds are between a mother and her calf. [6]
The gestation period in manatees lasts for 12–14 months, after which they give birth to one calf at a time or, rarely, twins. [58] When twins are born, they are fraternal twins and are dizygotic. [62] When a calf is born, it usually weighs 60–70 lb (27–32 kg) and is 4.0–4.5 ft (1.2–1.4 m) long.
The oldest manatee in captivity was Snooty, [162] at the South Florida Museum's Parker Manatee Aquarium in Bradenton, Florida. Born at the Miami Aquarium and Tackle Company on July 21, 1948, Snooty was one of the first recorded captive manatee births. He was raised entirely in captivity, [163] [164] and died at the age of 69. [165]
This is because in asexual reproduction a successful genotype can spread quickly without being modified by sex or wasting resources on male offspring who will not give birth. Some species can produce both sexually and through parthenogenesis, and offspring in the same clutch of a species of tropical lizard can be a mix of sexually produced ...
Pregnant male seahorse. Male pregnancy is the incubation of one or more embryos or fetuses by organisms of the male sex in some species. Most species that reproduce by sexual reproduction are heterogamous—females producing larger gametes and males producing smaller gametes ().
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] In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian ...
Snooty (July 21, 1948 – July 23, 2017) was a male Florida manatee that resided at the Bishop Museum of Science and Nature's Parker Manatee Aquarium in Bradenton, Florida. He was one of the first recorded captive manatee births, and at age 69, he was the oldest manatee in captivity, [1] and possibly the oldest manatee in the world. Due to his ...