Bergmann's rule
Bergmann's rule
Biological rule stating that larger size organisms are found in colder environments.
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Readers' pathsAug 2026 – Oct 2026
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Allen's rule
Relation of habitat temperature and limb length.
47%
Pygmy peoples
Ethnic group.
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Carl Bergmann (anatomist)
German biologist (1814–1865).
4.9%
Biological rules
Generalized principle to describe patterns observed in living organisms.
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Form of thermoregulation by body size.
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Genus of cactus.
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Clade
Group of a common ancestor and all of their descendants.
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Indigenous people of Northern Europe.
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Species of ant.
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Deep-sea gigantism
Tendency for deep-sea species to be larger than their shallower-water relatives.
1.9%
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Wolf
Species of canine.
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Bald eagle
Bird of prey species of North America.
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Siberian tiger
Tiger population in Northeast Asia.
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Deep-sea gigantism
Tendency for deep-sea species to be larger than their shallower-water relatives.
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Medium-sized North American wild cat.
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Platypus
Species of mammal.
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Megafauna
Large animals.
4.8%
Allen's rule
Relation of habitat temperature and limb length.
4.1%
Cave hyena
Extinct subspecies of carnivore.
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Species of deer.
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