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Occipital condyle of Tyrannosaurus rex, 117 Ornithischians, 125 Osborn, Henry Fairfield, 66 description of Tyrannosaurus rex by, 79-80 hunter, Tyrannosaurus rex as, 207 mounting of Tyrannosaurus rex by, 80-83 naming of Tyrannosaurus rex, 61-62, 64 naming of Tyrannosaurus rex be, 133 Osteoporosis in dinosaur bone, 176

Painting of Tyrannosaurus rex by Charles R. Knight, 85 by Richard Rush, 86-88 Paleontologist, defined, 25 Palynologists, 145

Parenting, by Tyrannosaurus rex, 167-170

Plant eaters, 14

Plesiosaurs, 124

Pollen grains, 144-145

Prey of Tyrannosaurus rex, 200

Pterosaurs, 124, 163

Pubis of Tyrannosaurus rex, 119

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