Fabian Cassan's Book of Wonderful Worlds, while providing accurate and practical information on the types of birds, introduces specific species with simple expression and shiva for each age group. Birds are believed to be bulky, warm, open, waggled, and fallow. Most birds have the ability to fly. There are nearly 10,000 bird species around the world. These animals are the most prevalent type of tetanus vertebrae and can be found from the Arctic to the Antarctica.