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Additional info for Animal Life: Secrets of the Animal World Revealed
Today’s mammals also have fur and mammary glands, but we cannot be sure about the many fossil forms. The early ancestors of mammals diverged from reptilelike amniotes more than 200 million years ago. Mammalia Species 5,000 PAGE 68 VERTEBRATE GROUPS Although vertebrates are a very diverse group of animals, only about 50,000 species have been identiﬁed—a tiny fraction of all animal species. The ﬁrst vertebrates were primitive ﬁshes, and ﬁshes make up more than half of all living vertebrate species.
PASSERIDS AUSTRALASIAN BABBLERS Pomatostomidae Species 5 AUSTRALIAN TREECREEPERS Climacteridae Species 7 LOGRUNNERS Orthonychidae Species 3 BOWERBIRDS Ptilonorhynchidae Species 18 Passerida A group of songbirds comprising an extremely varied mixture of species. Some subgroups are very distinct but the true relationships between the different groups are yet to be resolved. They include about one-third of the world’s bird species. ANIMAL KINGDOM 58 Birds the tracts are harder to deﬁne. Feathers provide insulation, enable ﬂight, and need to be replaced regularly through the process of molting, usually once or twice a year.
6 OTHER FAMILIES Acrodonta Species 567 Species 570 BIRDS Archosaurs with asymmetrical ﬂight feathers (lost in some ﬂightless species). Many dinosaurs had feathers, but they were not ﬂight feathers. More recently evolved birds—not including the primitive tinamous and ratites—have many more shared features, including a horny, toothless bill and a keeled breastbone. Aves Species 9,500 CROCODILIANS Crocodylia Elongated, limbed reptiles covered with thick leathery plates under which are bony plates on their top surface.