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A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of the corkscrew-like flagella of many prokaryotes).
Giraffe gestation lasts 400–460 days, after which a single calf is normally born, although twins occur on rare occasions. [105] The mother gives birth standing up. The calf emerges head and front legs first, having broken through the fetal membranes , and falls to the ground, severing the umbilical cord . [ 17 ]
Another example is the blue wildebeest, the calves of which can stand within an average of six minutes from birth and walk within thirty minutes; [5] [6] they can outrun a hyena within a day. [ 7 ] [ 8 ] [ 9 ] Such behavior gives them an advantage over other herbivore species and they are 100 times more abundant in the Serengeti ecosystem than ...
The San Diego Zoo has exhibited okapis since 1956, and their first okapi calf was born in 1962. [50] Since then, there have been more than 60 okapis born at the zoo and the nearby San Diego Zoo Safari Park, the most recent being Mosi, a male calf born on 21 July 2017 at the zoo. [51]
The pelts, particularly from the calves, are sometimes used as a substitute for red fox pelts, because the texture is difficult to differentiate. Like their domestic descendant, the llama, the guanaco is double-coated with coarse guard hairs and a soft undercoat, the hairs of which are about 16–18 μm in diameter and comparable to cashmere .
A new analysis of three-toed fossil footprints that date back more than 210 million years reveals that they were created by bipedal reptiles with feet like a bird’s.
Calves are born after a gestation period of up to nearly two years. [50] The calves are cared for by their mother and other young females in the group, known as allomothering. [33] African elephants show sexual dimorphism in weight and shoulder height by age 20, due to the rapid early growth of males. By age 25, males are double the weight of ...
The calves weigh about 21 kg (46 lb) at birth [14] and scramble to their feet within minutes, being able to move with the herd soon afterwards, [33] a fact on which their survival relies. [58] The main predator of the calves is the spotted hyena. The calving peak period lasts for 2–3 weeks, and in small subpopulations and isolated groups ...