Figure 5
From: First terror bird footprints reveal functionally didactyl posture
Measurements on fossil footprints. FL footprint length, FW footprint width; II, III, IV: length of digits II to IV; MTl, MTw: length and width of metatarso-phalangeal pad; II-IV: total divarication; II–III, III–IV: angle between digits II and III and between III and IV, respectively. Cl-II: length of claw II; TC: tip of claw II; Cl-III, Cw-III: length and width of claw of digit III; Cl-IV, Cw-IV: length and width of claw of digit IV; PA pace angulation; PL pace length, Fr footprint rotation with respect to the midline, Tbe external trackway breadth, Bbt breadth between tracks.
