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]
Alkaloids tutorial all along with the key concepts of History of Alkaloid, Properties of Alkaloid, Distribution in Nature of alkaloid, Extraction of alkaloid, Biosynthesis of Alkaloids, biological role of Alkaloids and Applications of Alkaloids
double indicator method tutorial all along with the key concepts of experiment, requirements, procedure, problem, results, treatment of results
Linear Collision tutorial all along with the key concepts of Classification of Collisions, Perfectly Inelastic Collision, Equations for Kinetic Energy and Linear Momentum, Energy lost in perfectly inelastic collisions, Explosions, Elastic and Inelastic Collisions, Elastic Collision Formula
management accounting, that seeks to meet the accounting requirements of managers and financial accounting, that seeks to meet the accounting requirements of all of the other users.
theory and lecture notes of cursors and data management all along with the key concepts of cursors, data management, operations on cursors, cursor positioning. tutorsglobe offers homework help, assignment help and tutor’s assistance on cursors and data management.
The issued share capital or allotted share capital is share capital that has been issued to shareholders.
Ecology tutorial all along with the key concepts of concepts and Principles in Ecology, Ecosystem, Community, Population, Habitat, Factors which influences in an Ecosystem
Breeding methods tutorial all along with the key concepts of Mode of reproduction, Self fertilizing crops or autogamous crops, Mass selection, Selection of cross-pollinated crops, Mass selection, Recurrent selection, Breeding of Asexually Propagated Crops
Amphibia tutorial all along with the key concepts of Features of Amphibians, Features of Toad and Frog, Ecological Adaptation of Amphibians, Difference between Frog and Toad
tutorsglobe.com defects of the ear assignment help-homework help by online ear tutors
Plant anatomy (Ana = as under, tamnein = to cut) is the learning of inner structure and organization of plants, particularly of their parts by the source of dissection and microscopic examination.
Depth First Search-Assignment help and Homework help along with the key concepts of DFS algorithm Implementation, DFS Solution, Iterative Deepening and Depth Limited Search.
Don’t hesitate to avail the impeccable Gender in Health and Body Assignment Help service from the qualified tutors at low prices to score high.
tutorsglobe.com method of work assignment help-homework help by online mendels experiments tutors
Get customized solutions from qualified MS-Office Applications Assignment Help tutors and score A++ grades at viable price range.
1959222
Questions Asked
3689
Tutors
1477790
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!