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These animals have evolved to only need one pair of limbs, whether arms or legs. Any other limbs have not only become vestigial but have disappeared altogether.
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This category has the following 2 subcategories, out of 2 total.
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The following 2 pages are in this category, out of 2 total.
78:Pages in category "Animals with only two limbs"
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120:Animals by adaptation
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62:Sirenoidea
42:Cetaceans
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96:Moa
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31:C
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