Thumbs Are Handy Digits
Fingers and toes are called digits. The thumb is the shortest, thickest digit on the human hand and moves in a different direction than the other digits. Human thumbs are called opposable thumbs. They are called opposable because the thumb can be moved around to touch the other fingers, which gives people the ability to grasp things.
Most primates (humans, apes, and Old World monkeys) and some other animals have opposable thumbs. Humans can move their thumb farther across their hand than any other primate.
Having opposable thumbs helps in grasping things more easily, picking up small objects, and eating with one hand.
More About Opposable Thumbs
An opposable thumb is a physical adaptation. An adaptation is a feature that helps a plant or animal survive in its habitat. Adaptations can either be physical (a part of the body) or a behavior an organism has developed.
Swimming in a school would be a behavioral adaptation for a fish that helps keep it from being eaten by other animals. An opposable thumb is a physical adaptation for primates. Opposable thumbs help monkeys and apes climb trees and gather and eat their food. Opposable thumbs help humans operate tools to make use of resources in our environment.
Other Animals with Opposable Thumbs
As mentioned, other primates besides humans have opposable thumbs. Chimpanzees, gorillas, and orangutans have opposable thumbs. Many of these primates also have toes on their feet that can function like an opposable thumb. These “opposable toes” are particularly useful in climbing trees.
Opossums have toes on their hind feet that help them grip branches and climb. Giant pandas have a bony portion of their wrist bone that they use like an opposable thumb to grasp bamboo when they eat.
2006-07-06 03:47:45
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answer #1
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answered by Primrose 4
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Panda - Panda paws have five clawed fingers plus an extra bone that works like an opposable thumb. This "thumb" is not really a finger (like the human thumb is), but an extra-long sesamoid bone that works like a thumb.
Koala - opposable toe on each foot, plus two opposable digits on each hand
Opossum - opposable thumb
Cebids (New World primates of Central and South America) - some have opposable thumbs
Bornean Orangutan - opposable thumbs so that its forefeet are really like hands. The interdigital grip gives them the ability to pick fruit. They also have an opposable big toe.
The 3-toed sloth does not have opposable thumbs, however the 4-toed sloth does.
2006-07-06 04:17:16
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answer #2
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answered by mroof! 6
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normal pets dont have thumbs. They have things called dewclaws, mostly only on the front two paws as a result of evolution. This used to be a toe, but, gradually, over the years, evolution kicked in because they did not have a need for it. Some farm animals such as cows, sheep, goats, and pigs have two. Monkeys and other primates are not suitable pets, but do have opposable thumbs like us.
2006-07-06 07:26:11
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answer #3
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answered by lita k 2
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Some monkeys and humans are the only creatures with thumbs. Many mammals have a 5th digit on the front foot but it is called a dewclaw and isn't usable.
2006-07-06 03:55:06
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answer #4
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answered by BB 5
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I think monkeys and people are the only animals with oposable thumbs
2006-07-06 03:43:16
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answer #5
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answered by Anonymous
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I thought humans were the only animals with opposable thumbs?!?!?
2006-07-06 03:42:54
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answer #6
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answered by redsgirl 3
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1 - monkey
2006-07-06 03:54:49
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answer #7
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answered by joe i 1
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frogs have thumbs but they arent opposible
2006-07-06 03:42:54
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answer #8
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answered by Mic C 2
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I'm not sure that any animal does.
2006-07-06 03:43:53
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answer #9
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answered by Justsyd 7
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aposable: gorrila and money
nonapossible: frog (i think)
2006-07-06 06:30:30
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answer #10
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answered by cherry♥blossoms 3
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