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Class Aves – The Biology Classroom
Matt Wedel: Hunting the inflatable dinosaur
Birds have hollow bones – Dickinson County Conservation Board
PPT - BIRDS PowerPoint Presentation, free download - ID:2011612
Hollow Bird Bones - Adaptations for Flight - YouTube
2 February 2012 Closer Look at Adelie Penguins | PolarTREC
Birds have hollow bones, which help them fly. | Beautiful Bird Pictures
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Bird Bone Photograph by Steve Gschmeissner/science Photo Library - Pixels
The Unique Characteristics of Birds | hubpages