"Velociraptor" is geologically younger than "Deinonychus", but even more closely related. Another dromaeosaurid species, "Deinonychus antirrhopus", may display partial flight capacities. In the 1960s, paleontologist John Ostrom began work on the theropod "Deinonychus". Dr. Dinosaur is an "intelligent", talking dinosaur who resembles a Deinonychus or Utahraptor. Ostrom compared "Deinonychus" to the ostrich and cassowary. They are encountered by the "Deinonychus", and everyone except Thrush is slaughtered. The largest specimens are comparable in size to "Deinonychus" and "Unenlagia". Other analyses have often included other genera, usually "Deinonychus" and "Saurornitholestes", and more recently "Tsaagan". On "S.U.I.Z.I.D." his place is taken by Marco Kehren from the band Deinonychus. Sheer attacked Foolscap and his Megalosaurus with Deinonychus Trio. A study on "Deinonychus" tooth isotopes suggests precociality in the genus. Ostrom described this specimen and revised his skeletal restoration of "Deinonychus". Old Lace, a genetically engineered "Deinonychus" telepathically linked with Gert Yorkes, appears in the series. In 2006, Grellet-Tinner and Makovicky reported an egg associated with a specimen of "Deinonychus". The "Deinonychus" also appears on the Watch YouTube game.