1996 UNITED NATIONS THE UGLY DUCKLING BIRDS FIRST DAY COVER.


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1996 UNITED NATIONS THE UGLY DUCKLING BIRDS FIRST DAY COVER.
Description

Birds (class Aves) are winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most varied of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic.