What makes a bird a bird?

All birds belong to the group of animals called vertebrates, meaning animals having a backbone. Birds make up a special group of vertebrates called aves. Examples of other groups of vertebrates are — fish, amphibians, mammals and reptiles. read more

With roughly 10,000 unique bird species in the world, it can be difficult to identify exactly what makes a bird a bird, but these remarkable creatures share a number of characteristics that help classify them as "birds." read more

” Highlight the key points that all birds have feathers, two wings, two legs, hollow read more