ROUNDSTUBE/aven1961

157th Video of ROUNDSTUBE describes about the Hot Air Balloon Day being celebrated annually on 5th June and this marks the impact hot air balloons have had on travel and leisure. The heated air inside the envelope has a lower density than that of the cold air outside, and this causes the balloon to rise. Hot-air balloons are commonly used for recreational purposes. In addition to quiet morning or afternoon flights drifting cross-country to enjoy the view, many balloonists enjoy competitive sporting events and attempting to set new records. A balloonist may fly alone in the basket or carry several passengers. Three years after the massive devastation brought by the eruption of Mt. Pinatubo, the hot air balloon festival aims to jumpstart Pampanga's economy. Another objective is to position the province as a center of aviation in the Philippines. In 1994, there were 21 balloon pilots from 10 different countries. Hot air balloon festivals are held annually in many places throughout th

Birds are a group of warm-blooded vertebrates characterized 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 5.5 cm bee hummingbird to the 2.8 m ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. 5 Major Characteristics of Birds are as follows: Feathers. Feathers are the defining characteristic of Aves, found on every living species of bird and no other class of animal. ...Wings. All birds have wings, although not all birds fly. ...Beak. All birds have beaks, or bills, made of a bony core surrounded by a thin layer of keratin. ...Eggs. ...Skeleton. Weasels, snakes and foxes all eat birds – and so do other birds, including hawks, owls and gulls. They all have feathers, wings, and a beak, which means they are all birds. Birds share many characteristics with reptil