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Most bipedal animals move with their backs close to horizontal, using a long tail to balance the weight of their bodies. The primate version of bipedalism is unusual because the back is close to upright (completely upright in humans), and the tail may be absent entirely. Many primates can stand upright on their hind legs without any support.
Humans adapted to heat early on. In Africa, the climate selected for traits that helped them stay cool. Also, humans had physiological mechanisms that reduced the rate of metabolism and that modified the sensitivity of sweat glands to provide an adequate amount for cooldown without the individual becoming dehydrated. [17] [20]
But while the new study explains the “how” of tail loss in humans and great apes, the “why” of it is still an open question, said biological anthropologist Liza Shapiro, a professor in the ...
Feet have evolved many forms depending on the animal's needs. One key variation is where on the foot the animal's weight is placed. Some vertebrates: amphibians, reptiles, and some mammals such as humans, bears, and rodents, are plantigrade. This means the weight of the body is placed on the heel of the foot, giving it strength and stability.
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 ...
“I do feel like back in the day there were not that many people on the ski area skinning up, it was more for backcountry skiing. ... “A group of friends wanted to do a full moon ski, and that ...
Snowflakes, and snow in general, are actually able to make the world around them quiet too. The science of silent snowflakes: The most common type of snowflake, called a dendrite, has six "arms ...
Sheep-rearing programs began to import Yorkshire, Berkshire, Spanish merino, and numerous Chinese and Mongolian sheep breeds, encouraged by government promotion of sheep farming. However, a lack of knowledge on the farmer's part of how to successfully keep sheep, and the government's failure to provide information to those importing the sheep ...