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' s , they roll their eyes and say that it 's just because I had extended time . Soon our guides begin catching large Russell 's vipers ( Vipera russelli ) , which lie curled in the fields . The lower jaw , or mandible , consists of two bones that meet at the chin but easily separate in the process of decay . My fascination with paleontology began at age 10 when I read the children 's book " All About Dinosaurs .