Question

The main features of birds. How can birds be described according to examples of representative species, basic morphology, skin, respiration, circulation, nitrogen waste, thermal control and types of reproduction?

Answer 1

during late 1990s- Aves are most commonly defined phylogenetically as all descendants of the most common recent ancestors of mordern birds and archaeopteryx lithographica.

Examples of representatives Species: Chickens , Sparrows, Parrot, Penguines, Ostriches etc.

Basic Morphology: Aerodynamic body, feathers, pneumatic bones, horny beaks.

Skin: Impermeable keratinized, feathers, Uropygial gland.

Respiration: Pulmonary respiration.

Circulation: Closed and complete, Heart with four chambers

Nitrogenous waste: Uric Acid.

Thermal control: Homeothermic.

Types of reproduction: Sexual, internal fertilization, shelled eggs with extra embryonic membrane.