Fig. 1: Early Cretaceous enantiornithine IVPP V12707.
From: Cretaceous bird with dinosaur skull sheds light on avian cranial evolution

a Photograph. b digital reconstruction. at atlas, ca caudal vertebrae, ce cervical vertebrae, dt distal tarsals, lfe left femur, lil left ilium, lis left ischium, lpu left pubis, mt II–IV metatarsals II to IV, pd II–IV pedal digits II to IV, ph proximal phalanx of hallux, pt proximal tarsals, py pygostyle, rb rib, rfe right femur, rfi right fibula, ril right ilium, ris right ischium, rpu right pubis, rti right tibia, sk skull, sv sacral vertebra, tv thoracic vertebrae. Scale bars, 10 mm.