Fig. 1
From: The relationship between sternum variation and mode of locomotion in birds
Overview of sternal variation. Sterna shown in lateral view (above) and ventral view (below). A Casuarius casuarius (Southern cassowary); B Oceanodroma leucorhoa (Leach’s storm petrel); C Calandrella cinerea (Red-capped lark); D Ramphastos ambiguous (Yellow-throated toucan); E Alectoris chukar (Chukar); F Falco sparverius (American kestrel). Scale bars: 10 mm. Silhouettes sourced from phylopic.org, credited to (in order of appearance): Casuarius casuarius uncredited; Procellariifomes by Juan Carlos JerÃ; Aluadidae uncredited; Ramphastidae by FJDegrange; Phasianidae by Elisabeth Östman; Falco by Liftarn