body size

References

Images

An illustration of the extinct mammal Batodonoides vanhouteni, showing a small, shrew-like animal with a pointed snout, large eyes, and a long tail, next to a scale indicating its body length is about 3 centimeters or 1 inch.

Illustration of a Brontosaurus dinosaur with a long neck and tail, walking on four legs, shown beside a faint outline of an elephant for size comparison. Scale bars indicate the Brontosaurus measures about 20 meters (66 feet) long.

Illustration comparing the sizes of a female, male, and infant megalodon (Carcharocles megalodon) with a great white shark (Carcharodon carcharias), showing the megalodon as much larger. Human and elephant silhouettes provide additional scale. Measurement bars indicate 3 meters and 9 feet for reference.

Illustration of the giant sauropod dinosaur Dreadnoughtus, shown with a long neck and tail, standing next to a much smaller elephant for size comparison. Scale bars indicate 3 meters and 9 feet, with text noting Dreadnoughtus measured 85 feet (25.9 meters) from head to tail.

Illustration comparing the heights of twelve dog breeds, from smallest to largest: Chihuahua, West Highland White Terrier, French Bulldog, Beagle, English Bulldog, Standard Poodle, Dalmatian, Labrador Retriever, German Shepherd, Bernese Mountain Dog, Great Dane, and Irish Wolfhound, with labeled height ranges above each breed.

body size

biology

Also known as: size

Written by

The Information Architects of Encyclopaedia Britannica

Learn about this topic in these articles:

animal
Evolution of ecological roles
…permitted an increase in body size, which gave rise to successive levels of predators. Quite early in the rapid diversification of animal life, protective hard shells appeared, a defense against predators but later also a means of enabling animals to expand outward from the seas. The intertidal areas, with partial…
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…permitted an increase in body size, which gave rise to successive levels of predators. Quite early in the rapid diversification of animal life, protective hard shells appeared, a defense against predators but later also a means of enabling animals to expand outward from the seas. The intertidal areas, with partial…
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Armillaria
Largest specimens
mat (mycelium) can reach extraordinary proportions. In 1992 a mat of A. bulbosa was identified in a mixed oak forest near Crystal Falls, in Michigan’s Upper Peninsula. Genetic testing on sample mushrooms gathered throughout the area determined that all were produced by a single supporting mycelium that extended over more…
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mat (mycelium) can reach extraordinary proportions. In 1992 a mat of A. bulbosa was identified in a mixed oak forest near Crystal Falls, in Michigan’s Upper Peninsula. Genetic testing on sample mushrooms gathered throughout the area determined that all were produced by a single supporting mycelium that extended over more…
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bird
General features
…(pneumatic skeletons) because the maximum size attainable by flying birds is limited by the fact that wing area varies as the square of linear proportions, and weight or volume as the cube. During the Pleistocene Epoch (2.6 million to 11,700 years ago) lived a bird called Teratornis incredibilis. Though similar…
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…(pneumatic skeletons) because the maximum size attainable by flying birds is limited by the fact that wing area varies as the square of linear proportions, and weight or volume as the cube. During the Pleistocene Epoch (2.6 million to 11,700 years ago) lived a bird called Teratornis incredibilis. Though similar…
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How Tall Are Giraffes?
tallest land animals. Males (bulls) may exceed 5.5 meters (18 feet) in height, and females (cows) are about 4.5 meters (15 feet) tall. A bull’s height is comparable to a two-story building, while a cow is equivalent to about a one-and-a-half-story building. Despite being slightly…
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tallest land animals. Males (bulls) may exceed 5.5 meters (18 feet) in height, and females (cows) are about 4.5 meters (15 feet) tall. A bull’s height is comparable to a two-story building, while a cow is equivalent to about a one-and-a-half-story building. Despite being slightly…
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human evolution
Increasing brain size
Worldwide, average body size also decreased in H. sapiens from 35,000 years ago until very recently, when economically advanced peoples began to grow larger while less-privileged peoples did not.
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Worldwide, average body size also decreased in H. sapiens from 35,000 years ago until very recently, when economically advanced peoples began to grow larger while less-privileged peoples did not.
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primate
Size in evolutionary perspective
In evolutionary terms, increase in size has probably played a large part in determining the direction of primate evolution. Early primates of about 50 million years ago were small forest-living creatures whose molar teeth bore high, pointed cusps but were neither as tall nor as pointed as those of their…
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In evolutionary terms, increase in size has probably played a large part in determining the direction of primate evolution. Early primates of about 50 million years ago were small forest-living creatures whose molar teeth bore high, pointed cusps but were neither as tall nor as pointed as those of their…
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life
Sizes of organisms
The sizes of organisms on Earth vary greatly and are not always easy to estimate. On the large end, great stands of poplar trees entirely connected by common roots are really a single organism. A variety of influences place an upper limit to…
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The sizes of organisms on Earth vary greatly and are not always easy to estimate. On the large end, great stands of poplar trees entirely connected by common roots are really a single organism. A variety of influences place an upper limit to…
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What Is the Largest Animal on Earth?
It is also the largest animal to have ever existed. These marine giants can weigh approximately 150 metric tons and stretch over 30 meters (98 feet) in length. There are reports of blue whales reaching lengths of 33 meters and weights of about 200 metric tons. One of the…
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It is also the largest animal to have ever existed. These marine giants can weigh approximately 150 metric tons and stretch over 30 meters (98 feet) in length. There are reports of blue whales reaching lengths of 33 meters and weights of about 200 metric tons. One of the…
Read More