A much-exploited subject treated judiciously and thoroughly. Sattler doesn't play up the awesomeness of the dinosaurs, the adventure of fossil hunting (this subject in fact isn't mentioned), or the recent controversies and revisions in views of the dinosaurs. Rather, she unobtrusively works the new findings and theories into her descriptions, noting carefully that certain dinosaurs ""were probably"" warm-blooded, others ""must have been"" pood hunters or ""might have"" hunted in packs or ""may have"" received some parental care, and following up with the evidence for these assumptions. Approximately 75 dinosaurs are classified and described in entries averaging about a page, and all are pictured--tails aloft, according to the newer view--in drawings that sometimes fill the oversized (8 3/4 x 11fl) pages. Sattler also includes a description of the earth's geology, flora, and so on for each mesozoic period, and ends with a succinct, critical review of the theories of dinosaur extinction. Altogether, it's a boon for serious dinosaur buffs. The text reads at about a ten-to-twelve-year-old level, but the book's clarity, illustrations, and subject-interest should make it accessible to eight- or nine-year-olds as well.