Let us learn about the comparison between ratites and carinates. Comparison # Ratites: (Palaeognathae): 1. Distribution: Discontinuous, except Ostrich, they are confined to southern continents and islands. 2. Habitat: Terrestrial—usually living in desert. 3. Size: Usually large Exoskeleton: 4. Tail: Functionless. 5. Feathers: Devoid of hooks and hooklets. The barbs are free. 6. After shaft: Usually well-developed. 7. Rectrices: Absent [...]
In this article we will discuss about the origin of flight in birds. Birds constitute a very specialised group of vertebrates which have evolved from reptiles during Mesozoic era. The actual documentary records of the stages showing how such reptiles were transformed into birds are rare because of the non-availability of abundant avian fossils. Two fossil specimens of Archaeopteryx discovered [...]
In this article we will discuss about Birds:- 1. Characteristic Features of Birds 2. Habit and Habitat of Birds 3. Structure 4. Digestive System 5. Respiratory System and Sound Producing Organ 6. Circulatory System 7. Nervous System and Sense Organs 8. Urinogenital System. Contents: Characteristic Features of Birds Habit and Habitat of Birds . Structure of Birds Digestive System of [...]