Several changes have been made since the first edition of The Dinosauria (Weishampel, Dodson & Osmolska, 1990). The front cover is graced by a group of indisputably bird-like creatures. This is in contrast to the particularly reptilian cover stars of the latter publication and reflects the editors’ updated perception of a bird–dinosaur relationship as the ‘logical sequel of phylogenetic systematics’ – a methodology that is emphatically endorsed in the new book. Other changes are the addition of a numerical cladistic analysis to each of the taxonomic chapters and some changes in authorship (the number of authors has almost doubled from...

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