What is a bird?
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Birds, also known as Aves, are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. read more
Source: en.wikipedia.org
There are nearly 10,000 different bird species, and they all share traits that make them uniquely birds. read more
Source: thespruce.com
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Source: en.wikipedia.org
Further Research
All About Birds
www.kidzone.ws
Define Bird at Dictionary.com
www.dictionary.com
Definition of Bird by Merriam-Webster
www.merriam-webster.com
What Is a Bird?
www.eol.org
