Nichollsia

*Row 1: Sinosauropteryx prima, Cryolophosaurus ellioti, Vultur gryphus Row 2: Gypaetus barbatus, Concavenator corcovatus, Carnotaurus sastrei Row 3: Deinocheirus mirificus & Tarbosaurus bataar, Balaeniceps rex, Archaeopteryx lithographica & Compsognathus longipes Row 4: Anchiornis huxleyi, Dakotaraptor steini & Ornithomimus, Nanuqsaurus hoglundi, Passer domesticus Row 5: Spinosaurus aegyptiacus, Bubo scandiacus & Anas rubripes, Coelophysis kayentakatae

a) Skeletal reconstruction of Enigmacursor; b) Life reconstruction of Enigmacursor by Bob Nicholls

Pelvis (fused ilia and pubes) of UALVP 48778, holotype of Hesperonychus elizabethae, from the late Campanian Dinosaur Park Formation of Alberta, Canada. Fossil collected by Dr. Elizabeth Nicholls. Prepared by Clive Coy. Digital photography by Nick Longrich. Additional digital editing by Nick Longrich.