Table 1 All specimens used in this study. Table showing all specimens which have been included in the current study, with genus, species, and clade labelled. The specimen number and sources of the specimen photos are also listed. Institutional abbreviation: AMNH, American Museum of Natural History; BMNHC, Beijing Museum of Natural History; IGM, Institute of Geology, Mongolian Academy of Sciences; IVPP, Institute for Vertebrate Paleontology and Paleoanthropology; MPC, dinosaur collection of the Paleontological and Geological Center, Mongolian Academy of Sciences; UALVP, University of Alberta, Laboratory of Vertebrate Paleontology; YPM, Yale Peabody Museum, Yale University

Deinonychus

antirrhopus

Velociraptorine

YPM 5210, YPM 5230

[28], Figure 4

Dromaeosaurus

albertensis

Dromaeosaurinae

AMNH 5356

[29], Figure 1

Halszkaraptor

escuilliei

Non-eudromaeosaurian dromaeosaurid / “Halszkaraptorinae”

MPC D-102/109

[10], Figure 2

Linheraptor

exquisitus

Velociraptorinae

IVPP V16923

[30], Figure 1

Microraptor

zhaoianus

Microraptorinae

BMNHC PH881

[31], Figure 2

Saurornitholestes

langstoni

Velociraptorinae

UALVP 55700

[32], Figure 1

Sinornithosaurus

millenii

Microraptorinae

IVPP uncatalogued

[24], Figure 23C

Tsaagan mangas

mangas

Velociraptorinae

IGM 100/1015

[33], Figure 3

Velociraptor

mongoliensis

Velociraptorinae

AMNH FR 6516

[33], Figure 6

Velociraptor

mongoliensis

Velociraptorinae

IGM 100/25

[36], Figure 1

Gobivenator

mongoliensis

Troodontidae

MPC D-100/86

[37], Figure 3