ation , ▁d ating ▁to ▁the ▁early ▁A pt ian ▁age , ▁ 1 2 5 - 1 2 0 ▁million ▁years ▁ago . ▁Boh ai orn ith idae ▁was ▁first ▁co ined ▁as ▁a ▁family ▁of ▁en anti orn it he an ▁birds ▁by ▁Wang ▁and ▁colle agues ▁in ▁ 2 0 1 4 . ▁They ▁defined ▁it ▁as ▁the ▁natural ▁group ▁formed ▁by ▁all ▁descend ants ▁of ▁the ▁common ▁ancest or ▁of ▁the ▁type ▁species , ▁Boh ai orn is ▁gu oi , ▁and ▁Sh en qi orn is ▁m eng i . ▁ ▁Description ▁ ▁Similar ▁to ▁most ▁en anti orn it he ans , ▁bo hai orn ith ids ▁possessed ▁teeth ▁rather ▁than ▁a ▁be ak ▁as ▁in ▁modern ▁birds , ▁although ▁they ▁could ▁be ▁distinguished ▁from ▁other ▁en anti orn it he ans ▁due ▁to ▁the ▁structure ▁of ▁their ▁teeth . ▁Their ▁teeth ▁were ▁large , ▁robust ▁and ▁somewhat ▁con ical , ▁but ▁had ▁sharp ly ▁pointed ▁tips ▁which ▁cur ved ▁backwards . ▁The ▁first ▁few ▁teeth ▁of ▁the ▁pre max illa e ▁are ▁smaller ▁than ▁the ▁rest ▁of ▁the ▁teeth , ▁but ▁the ▁other ▁teeth ▁in ▁the ▁front ▁of ▁the ▁mouth ▁were ▁larger ▁than ▁those ▁in ▁the ▁back . ▁ ▁Boh ai orn ith ids ▁also ▁had ▁later al ▁trab ec ula e ▁( a ▁pair ▁of ▁long ▁and ▁thin ▁b ony ▁pro jections ▁on ▁the ▁rear ▁edge ▁of ▁the ▁stern um ) ▁which ▁not ▁only ▁extended ▁backwards , ▁but ▁also ▁out wards . ▁The ▁tips ▁of