File:The American Museum journal (c1900-(1918)) (17972357280).jpg

Title: The American Museum journal
Identifier: americanmuseumjo17amer (find matches)
Year: c1900-(1918) (c190s)
Authors: American Museum of Natural History
Subjects: Natural history
Publisher: New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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THE "OSTRICH" DINOSAUR AND THE "TYRANT' DINOSAUR 13 cestral form, the "bird catcher" of Jurassic time, OrnWiolestes. Thus the theories of several expert anatomists who have cooperated with the author in attempting to solve the riddle of this "ostrich mimic" indicate very great diversity of opinion and of less, descended from similar ancestors: Tyrannosmirus extremely large-headed, with powerful teeth, very short neck, and short, powerfully clawed fore limbs and enormous hind limbs provided with very powerful recurved claws; Struthio- niimus extremelv small-headed, the
Text Appearing After Image:
The "Ostrich Mimic" Dinosaur, Struthiomimus, and the "Tyrant" Dinosaur, Tyrannosaurus. — To il- lustrate the wide contrasts between the skeleton of the "ostrich mimic" dinosaur (right upper) and that of the "tyrant" dinosaur (left lower), animals which, notwithstanding their extreme unlikeness in adaptation to habits, descended from similar ancestors. Photographed to the same scale interpretation. It is agreed only, first, that the animal was a very swift run- ner, and, secondly, that it was in all probability herbivorous and that per- haps the hand was adapted for search- ing out and grasping some particular form of shrub or fruit. The contrast which this animal pre- sents to Tyrannosaurus gives us one of the greatest extremes known to science of two types adapted to most widely different habits which have, neverthe- toothless jaws sheathed in horn, the neck elongated and highly flexible, neither the fore nor the hind limbs adapted for seizing a live prey. In both animals the hind limbs are adapted to very rapid progression. In the case of Tyrannosaurus this is designed to over- take the prey, while in Struthiomimus this length of limb was doubtless to enable the animal to escape from ene- mies, among which may have been the Tyrannosaurus itself.

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