First Day Cover Postcard Bird Tchintchinxolo Thomasophantes Sanctithomae 1983 Wildlife A postage stamp is a

A postage stamp is a small piece of paper issued by a post office

which became the world's first mass-produced helicopter in 1942

Sharks Ocean Color Mountain Souvenir Sheet MNH

The giant panda is a conservation-reliant vulnerable species

and compound helicopters are all flying today

First Day Cover Postcard Bird Tchintchinxolo Thomasophantes Sanctithomae 1983 Wildlife A postage stamp is aFirst Day Cover Postcard Bird Tchintchinxolo Thomasophantes Sanctithomae 1983 Birds are a group of warm blooded vertebrates constituting the class Aves, 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 cm (2 in) bee hummingbird to the 2. 75 m (9 ft) ostrich. There are about ten