. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates ai scarlet-bellied toad that escapes attacks of storks because its warning color is associated with a bad taste, as storks have discovered. The commonest genus of frogs is Rana, sev- eral species of which are found in Europe and North America. Xenopus of Africa, and Pipa, of South America, are anurans of particular ana- tomical interest, as will appear later. The little tree frogs have adhesive discs at the ends of their fingers and to
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates ai scarlet-bellied toad that escapes attacks of storks because its warning color is associated with a bad taste, as storks have discovered. The commonest genus of frogs is Rana, sev- eral species of which are found in Europe and North America. Xenopus of Africa, and Pipa, of South America, are anurans of particular ana- tomical interest, as will appear later. The little tree frogs have adhesive discs at the ends of their fingers and toes that enable them when they leave the water to climb trees where they conceal themselves, persistently sending out their ventriloquistic calls. American genera are: the "cricket frog," Acris; the "swamp tree frog," Pseudacris; and the common tree frog, Hyla „. „„ „ , ' &' / Fig. 33. A tree frog, Hyla. (rig-33). (After Dickerson.) Many amphibians are remarkable for the ways in which they care for their eggs and young. Some examples are illus- trated by the sketches in Figure 28. 4. Class REPTILIA There are about 5500 species of living reptiles, of which over 300 are found in the United States. Although, as compared with amphibians, their legs lengthen and strengthen, "reptiles" (repere, to crawl) are named with an eye to the leg- less crawling snakes. The group includes not only snakes but also lizards, turtles, and alligators, as well as Sphenodon, a New Zealand genus contain- ing a single species. Also included is a vast company of forms now extinct, many of which were gigantic, that dominated the Mesozoic world through- out a dynasty that endured for ages. Reptiles are the first true land vertebrates freed from the necessity of returning to the water to breed. "Things that before swam in the water now went upon the ground" (Wisdom of Solomon). This saying is true even of alligators, certain turtles, and water snakes which,
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
