The National Geographic Magazine, Volume 194National Geographic Society., 1998 - Geography |
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Page 84
... feathers is hardly surprising . The ancestry of birds has aroused as much passionate debate as any puzzle in ... feathers are the heavy limbs of earthbound creatures . Birds are masters of the sky , superbly designed to defy gravity ...
... feathers is hardly surprising . The ancestry of birds has aroused as much passionate debate as any puzzle in ... feathers are the heavy limbs of earthbound creatures . Birds are masters of the sky , superbly designed to defy gravity ...
Page 90
... feathers that lacked the aerodynamic quality necessary for flight . Protarchaeopteryx Another discovery in China , Protar chaeopteryx resem- bles Archaeopteryx in many ways but is more primitive . The symmetrical feathers on its arms ...
... feathers that lacked the aerodynamic quality necessary for flight . Protarchaeopteryx Another discovery in China , Protar chaeopteryx resem- bles Archaeopteryx in many ways but is more primitive . The symmetrical feathers on its arms ...
Page 91
... feathers attached to the thumb . By altering airflow , the alula permits good maneuverability and control at low flying speeds , crucial for takeoffs and landings . Corvus At the zenith of forelimb evolution , the crow and other modern ...
... feathers attached to the thumb . By altering airflow , the alula permits good maneuverability and control at low flying speeds , crucial for takeoffs and landings . Corvus At the zenith of forelimb evolution , the crow and other modern ...
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adverse events afarensis africanus American Archaeopteryx Asst AUGUST birds bones bottlenose BOTTLENOSE WHALES called camera Canada Caudipteryx cetirizine CHIEN-CHI CHANG China Chinatown Chinese Chrysler 300M clinical trials creature Danes Danish Denmark diabetes dinosaurs Director disaster dogs dose drug Earth erectile dysfunction explore feathers feet female fire flood fossil frogfish human hurricanes images Inca Indonesia insulin island John JULY kids land lander light live look male Mars Mars Pathfinder Martian Mexico mg/kg miles million months NATIONAL GEOGRAPHIC SOCIETY NATURAL HAZARDS Nissan Nissan Pathfinder North orangutans Pathfinder patients pediatric PHOTOGRAPHS placebo Prize Protarchaeopteryx rain forest rats Rezulin rocks rover says scientists Sihetun sildenafil Sinosauropteryx species studies telescope there's theropods tion Titanic tornado town tree trip troglitazone VIAGRA whales wild wings winner YUKON RIVER ZYRTEC