paramacellodid, scincomorphan, and xenosaurid lizards, the shartegosuchid crocodyliform Kyasuchus, the tritylodontid cynodont Xenocretosuchus, the triconodont mammal Gobiconodon, the ceratopsian dinosaur Psittacosaurus, troodontid theropod dinosaurs, and sauropods, all of which have been described from the locality in the past few decades.
In 1987 the find was reported by Sergei Kurzanov and later that year discussed by Halszka Osmólska who suggested it could represent a specimen of the troodontid Borogovia.
Animals that may have shared the same habitat with Tsaagan include Protoceratops, Shuvuuia, the small mammal Zalambdalestes, the multituberculate mammal Kryptobaatar, as well as several lizards and two yet-undescribed species of troodontid and dromaeosaurid.