Bohaiornithidae of sexual dimorphism, with the feathers being used by male members of a species for courtship display. A subadult specimen of an indeterminate bohaiornithid described in 2017 preserved feathers on various parts of the head and body which were analyzed and determined to have been iridescent in life. A referred adult specimen of "Bohaiornis" was preserved with a several rocks concentrated in the stomach region. Rocks in the stomach of birds and other animals are often believed to be gastroliths swallowed to assist in the digestion of plant material. However, the rocks apparently swallowed by this specimen are much larger,
Russian given name dubbed "anthroponymic bang". According to Russian naming tradition in official speech people are addressed by their name followed by a patronymic. In official situations one's given name is always written or spoken in its legal form (name given at birth and documented in papers like birth certificate and passport). Prior to October Revolution canonical form was considered official. It was documented in baptismal register books. However, in birth certificate and other documents a secular form was used. Arising ambiguity was not considered important and didn't cause any legal consequences. In baptismal register books people bearing names Yuriy and Egor appeared