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You have accessResearch articles Abstract No vertebrate, living or extinct, is known to have possessed an odd number of limbs. Despite this ‘forbidden phenotype’, gaits that use odd numbers of limbs (e.g. tripedalism or pentapedalism) have evolved in both avian and mammalian lineages. Tripedal locomotion is commonly employed by parrots during climbing, who use their beaks as an additional support.
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