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2013 2:3 anthro anus biped butt deiwea dinosaur dromaeosaurid erection feather_hair feathers genitals greyscale hair hand_on_butt hi_res inviting looking_at_viewer looking_back lying male monochrome muscular muscular_anthro muscular_male nude on_front penis penis_backwards perineum prehistoric_species presenting presenting_hindquarters pseudo_hair raised_tail rear_view reptile saurischian scalie solo spelunker_sal spread_legs spreading tail theropod velociraptor