Birds have hollow bones, which help them fly. Link #39: the bones of birds are hollow! 42 facts about dinosaurs
Birds have hollow bones, which help them fly. | Beautiful Bird Pictures
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Link #39: The Bones of Birds Are Hollow! | Always Learning!
42 Facts about Dinosaurs
Birds have hollow bones, which help them fly. | Beautiful Bird Pictures
PPT - Adaptations PowerPoint Presentation, free download - ID:5372529