. Guide leaflet. HARBOR SEAL Phoca vitulinaLike other seals this species passes some time on land,coming out to bask in the sun, but the legs are of little use forlocomotion on land. All four limbs are changed into paddlesfor swimming, though the hair seals swim mainly with theirhind feet and the eared seals with their front HARBOR PORPOISE Phocaena communisThe porpoise is an example of a mammal fitted for livingonly in the water, and represents the extreme of modificationamong mammals. The hind limbs have been lost, their onlyvestiges being two little bones that represent the pelvis, o
. Guide leaflet. HARBOR SEAL Phoca vitulinaLike other seals this species passes some time on land,coming out to bask in the sun, but the legs are of little use forlocomotion on land. All four limbs are changed into paddlesfor swimming, though the hair seals swim mainly with theirhind feet and the eared seals with their front HARBOR PORPOISE Phocaena communisThe porpoise is an example of a mammal fitted for livingonly in the water, and represents the extreme of modificationamong mammals. The hind limbs have been lost, their onlyvestiges being two little bones that represent the pelvis, orhip bone: the front limbs have been changed into rigidpaddles, fit only for balancing or steering; locomotion iseffected by what is really the tip of the tail, which has beendeveloped into flukes for swimming. Note that unlike thetail of fishes the flukes of-whales and porpoises contain nobones.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
