Bird Sampler of the World
Birds are in the class Aves characterized by feathers, beaked jaws and laying of hard shell eggs.
Birds live worldwide and range in size from 2.2 inches to 9 feet and 2 inches tall.
Perching birds make up more than 50% of the known bird spocies.
Birds are social communicating with visual signals, calls and songs, cooperative breeding and hunting, mobbing of predators and are monogamous for one breeding season and sometimes for longer periods of time.
Many birds are economically important for humans as eggs, meat, feathers, fertilizer, recreational birdwatching, and pets.
Classification of birds is a contentious issue among scientists, evidence from modern bird anatomy, fossils and DNA have all been used to solve the problem but no strong consensus has emerged.
Birds live and breed in most habitats and on all seven continents.
The greatest bird diversity is found in the tropics.
Many bird species migrite annually over long distances to breeding grounds and then return to their starting point.
Many species have been established breeding populations in areas where they have been introduced by humans.
The ring necked pheasant has been introduced to many areas as a game bird.
Other birds have established breeding populations in areas where they have escaped from cages.
Some species have spread naturally as agricultural expansion created alternative habitats.
Flight is the primary means of movement for most birds and is used for searching for food and escaping predators.
Wing shape determines the bird's flight style either flapping, soaring, or a combination of the two styles.
Most birds are active during the day, a few are active at night while others are active at different times of the day based on the tides.
Bird diets are varied and include nectar, fruit, plants, seeds carrion, insects, and small animals.
Birds that use many strategies to find food and have a varied diet are called generalists.
The birds that have limited food items and strategies are called specialists.
Other birds obtain some of their food by stealing from other birds.
Birds* feathers require maintenance because of wear and tear, fungi, mites, and lice that attack them.
The birds need to preen, water bath, dust bath, or expose wings to sunlight to reduce feather damage.
Bird songs and calls are used for mate attraction, maintenance of territories, identification of other birds, and warning of predators.
Bird eggs are usually laid in a nest which is a cup, dome, plate, mound, or burrow. Others do not build a nest just fay their egg on bare rock, open ground, or on their feet.
Other birds lay their eggs in other birds nest for them to raise at the expense of their own.
Human activities have allowed the expansion of some species and decrease or extinction of other species.
Governments and conservation groups work to protect birs. by creating laws that preserve and restore bird habitat or by establishing captive populations for..