中空の鳥の骨 - 飛行への適応
Did you know that Birds have hollow bones, which make them lightweight and aid in flight?| #shorts
All about bird bones!
पक्षी की कितनी हड्डियां होती हैं?How many bones does a bird have?#birdslover#sciencefacts#shorts
ヤラ・ハリディ博士: 鳥の骨は空洞です、これがその仕組みです!
鳥と中空または空気の骨。
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