In 1993 on August 13 a large dromaeosaur claw was found at the Burkhant locality—which is the type locality of "Achillobator"—by a Japanese-Mongolian joint paleontological expedition. Later in 2010, paleontologist Mahito Watabe and colleagues reported that additional postcranial elements remains were found, all of them belonging to a large-sized dromaeosaurid. In 2007 Mongolian paleontologist Rinchen Barsbold and team reported new dinosaur fossil findings at the Shine Us Khuduk locality of the Bayan Shireh Formation. Among elements, an isolated pedal phalange II-2 (second phalanx of the second digit of the foot) shares similar traits to that of "Achillobator" and ""Troodon"". The remains were discovered during excavations of the Mongolian Academy of Sciences in 2005 and 2006.