Features of Class Aves (Birds):
Birds are said to have come from a common ancestor (monophyletic lineage) and are therefore associated through common origin. Modern birds contain traits associated to high metabolism, skill to fly. Some birds, particularly parrots, are among the cleverest animal species; number of bird species has ability to tools, and several social species show cultural transmission of knowledge across generations.
Adaptation to flight in birds is facilitated by light body weight (a consequence of the absence of teeth and ultra-light bones and air sacs), high body temperature, improved blood circulation, high metabolism, and acute vision (that enables avoidance of danger such as tree branches at high speed).
The class Aves is made of two subclasses like Archaeonithes (extinct ancient birds) and Neornithes (recent birds). So it is correct to say that all living birds belong to subclass Neornithes, that is further separated in three Superorders namely Odontognathae (extinct), Paleognathae and Neognathae.
Features of Subclass Archaeonithes:
Members of this subclass are extinct ancient birds. They were characterized by comprising clawed wings, reptilian style ribcage without large carina and presence of long, bony tail. Known members of group were Archaeopteryx and Archaeornis.
Characteristics of the Class Subclass Neornithes:
In this subclass, there are 3 superorders namely Odontognathae (extinct), Paleognathae and Neognathae.
Superorder Odontognathae:
Members of this superorder considered as modern birds, on account of anatomy are though extinct. As name signifies, they included teeth-like structures.
Unlike Archaeornithes, Odontognathae had short tails with well- developed carina for flight muscle attachment and wings are usually without claws (although few modern birds like kiwis have claws). Brain of Odontognathae seems to be fairly simpler than those of modern birds.
Superoder: Palaeognathae
The superorder Palaeognathae derived its name from paleognath, ancient Greek word for old jaws in reference to skeletal anatomy of palate of bird that is described as more primitive and reptilian than of other birds.
Orders under this superorder are given below:
Order: Struthioniformes (Ostriches, Emus, Kiwis)
Order Struthioniformes included birds known as ratites that are large flightless birds; these are birds which have lost their skill to fly and contain flat breastbone. Ratites have simplified wing bone structure, strong legs, and no feather vanes, making it unnecessary to oil feathers. Therefore, they contain no preen gland which has preening oil. This group is made up of of ostriches, rhea, cassowaries and emus.
Kiwis (Apteryx) are flightless birds endemic to New Zealand. Kiwi is national symbol of New Zealand. Kiwi is by far the smallest living ratites and lay largest eggs in relation to body size of any species of bird in world. Ostrich (Struthio) is one of two species of large flightless birds inhabitant to Africa, the only living member(s) of genus Struthio. Ostrich is the largest living species of bird and lays largest egg of any living bird.
Emu is the largest bird native to Australia and only extant member of genus Dromaius. It is second-largest existing bird in world by height, after its ratite relative, the ostrich. They contain long thin necks and legs. Emus can travel great distances at fast, economical trot and, if essential, can sprint at 50 km/h (31 mph) for specific distance at a time.
Order: Tinamiformes (Tinamous)
The Tinamous are found in Central and South America. They are one of the most ancient living groups of bird, they are associated to ratites. Usually ground dwelling, they are found in the range of habitats and can fly and contain keeled breastbone (shaped like wishbone). Though they look like other ground-dwelling birds like quail and grouse.
Tutorsglobe: A way to secure high grade in your curriculum (Online Tutoring)
Expand your confidence, grow study skills and improve your grades.
Since 2009, Tutorsglobe has proactively helped millions of students to get better grades in school, college or university and score well in competitive tests with live, one-on-one online tutoring.
Using an advanced developed tutoring system providing little or no wait time, the students are connected on-demand with a tutor at www.tutorsglobe.com. Students work one-on-one, in real-time with a tutor, communicating and studying using a virtual whiteboard technology. Scientific and mathematical notation, symbols, geometric figures, graphing and freehand drawing can be rendered quickly and easily in the advanced whiteboard.
Free to know our price and packages for online biology tutoring. Chat with us or submit request at [email protected]
atomic spectra tutorial all along with the key concepts of definition of atomic spectra, line spectra of atoms, spectrum of atomic hydrogen
The electronic home appliance that is employed to wash the several types of clothes without applying any physical efforts is termed as a Washing machine.
tutorsglobe.com mechanism of ascent of sap assignment help-homework help by online water transport tutors
Theory and lecture notes of How a Fixed Exchange Rate System Works all along with the key concepts of High Capital Mobility, Barriers to Capital Mobility, Limited Capital Mobility, Choice of Exchange Rate Systems. Tutorsglobe offers homework help, assignment help and tutor’s assistance on How a Fixed Exchange Rate System Works.
tutorsglobe.com peptic ulcer assignment help-homework help by online digestion tutors
tutorsglobe.com immunology assignment help-homework help by online microbiology tutors
tutorsglobe.com ribosomal rna assignment help-homework help by online structure of rna tutors
TutorsGlobe.com Nucleophilic Reactions Assignment Help-Homework Help by Online Benzene & Derivatives Electrophilic Substitution Tutors
Superposition and Thevenins Theorem tutorial all along with the key concepts of Tellegen's Theorem, Thevenin's equivalent, Star-Delta Transformation and Limitations of thevenins theorem
tutorsglobe.com parasites assignment help-homework help by online nutrition in fungi tutors
Social Insects tutorial all along with the key concepts of The Termites, Castes in Social Insects, Behavioral Adaptations of Termites, The Bees and Behavioral Adaptations of Bees
Discriminator is a demodulator. It divide audio signal from frequency modulated IF signal. Crystal diodes are employed like detector diodes.
tutorsglobe.com agammaglobulinemia assignment help-homework help by online genetic diseases tutors
tutorsglobe.com hepatitis assignment help-homework help by online digestion tutors
Polyethylene tutorial all along with the key concepts of Classification of Polyethylene, High density polyethylene, Low density polyethylene, Linear low density polyethylene, Production process of Polyethylene, Production process of Polyethylene, High-low pressure production process
1933763
Questions Asked
3689
Tutors
1475411
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!