. Adventures with animals and plants. Biology. Fig. 20 The spiny anteater of Australia and a Fig. 21 The duckbill of Australia. This iinvnnial model of the egg it has laid. (American museum also lays eggs. (American museum of natural OF natural history) history) in a pouch for a long time after birth. See Figure 384, page 433. The kanga- roos of Australia and the opossums of our country belong to this group. In one common species, the Virginia opos- sum, the animal when discovered pre- tends it is dead; it "plays '; There are several other kinds of mar- supials in Australia be
. Adventures with animals and plants. Biology. Fig. 20 The spiny anteater of Australia and a Fig. 21 The duckbill of Australia. This iinvnnial model of the egg it has laid. (American museum also lays eggs. (American museum of natural OF natural history) history) in a pouch for a long time after birth. See Figure 384, page 433. The kanga- roos of Australia and the opossums of our country belong to this group. In one common species, the Virginia opos- sum, the animal when discovered pre- tends it is dead; it "plays '; There are several other kinds of mar- supials in Australia besides kangaroos. The simplest mammals lay eggs. Duck- bills lay eggs and have bills like a duck but since they have mammary glands and hair they are considered to be mam- mals. Spiny anteaters and armadillos are other simple mammals. Now do Exer- cises 2, 3, and 4. If you would like to continue your study of mammals, you will find it useful to refer to some of the interesting books on mammals listed in the bibliography at the end of the book. CLASS - BIRDS The characteristics of birds. Birds have feathers. There are no exceptions. That is the characteristic by which you recoij- nize them. The feathers are usually lacking on the legs, which are covered with scales. There are two other char- acteristics almost as striking as the first: birds have beaks or bills without teeth and the forelimbs have the structure of wings. Birds, like mammals, are \\arm- blooded; their temperature, in general, is higher than that of mammals. Some of them, indeed, have a temperature of 112°. Like mammals they have four- chambered hearts and they breathe by means of lungs. There is much that \()u can discover for yoursrlf if you will fol- low the directions ir Exercises 5 and 6 carefullv\ Subdivision of the class. This class is subdivided into many different orders but the differences between the orders are technical and difficult to learn. In this section, we shall use a simple group- ing based mos
Size: 1947px × 1284px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
