Fig. 2: Comparison of centre-of-mass position between the duck breeds and other birds.
Morphospace (a), illustrates craniocaudal and dorsoventral CoM position in the three duck breeds compared to the larger avian dataset of Macaulay et al.12, who found that extant birds group into hindlimb-dominant and forelimb-dominant morphospace zones based upon their primary locomotor habits. Note that the total number of ducks in this plot amounts to four, as Macaulay et al., included a mallard in their original dataset (designated 1, with the new mallard designated 2). CoM values (distance in front and below the hip) have been normalised to body mass0.33. A reference figure showing where normalised CoM for each breed would be located if positioned against the mallard torso is presented in (b). Duck illustrations by S.R.R.C. silhouettes of other birds are public domain from www.phylopic.org.
