From Wikipedia, the free encyclopedia
Ptaki (Aves) su klasa znutřka podkmjena rjapnikow (Vertebrata). Na swěće je wokoło 9 600 družinow ptakow.
Město prědnjeju nohow maja křidle. Ale někotre ptaki njemóžeja z křidłomaj lětać, kaž na př. štrus, emu, pinguin.
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