190120th_centuryambiguous_genderambiguous_preyambiguous_speciesancient_artavianbeakbipedbirdcariamiformcharles_r_knightclawsdateddetaileddetailed_backgrounddipstick_wingsduofeathered_wingsfeathersfeetferalfull-length_portraitfurgraphite_(artwork)greyscalegriphead_tufthi_resholding_preyhuntinglarger_predlightlightinglooking_downmammalmonochromeopen_beakopen_mouthoutsidephorusrhacospinnedplantportraitprehistoricprehistoric_speciesquadrupedrealisticshadedshrubsignaturesize_differencesketchspread_wingsterror_birdterrorbirdtraditional_media_(artwork)treetuftwhite_bodywhite_featherswings