Theropod (dinosaur) Bird Track, positive Troodon The lack of a baculum

The lack of a baculum (penis bone) found in all lower primates

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the Protodonata were fast-flying with spiny legs that may have assisted in capturing prey

Struthiomimus differed from close relatives only in subtle aspects of anatomy

Paranthropus boisei (originally called Zinjanthropus boisei and then Australopithecus boisei until recently) was an early hominin and described as the largest of the Paranthropus species

Theropod (dinosaur) Bird Track, positive Troodon The lack of a baculumThe study of fossilized footprints, Ichnology, has become an important branch of paleontology. Footprints are trace fossils. They are considered trace fossils because they contain no fossil material, only the impressions left by the animal which made them. It is often difficult to determine with certainty which animal made a given print and therefore they are usually attributed to a group rather than a specific animal. The footprint specimens on this