Figure 8. More female Magellanic penguins than males had feather wear on the trailing edge of the flippers, and more females (n = 74) than males (43) had asymmetrical wear (more wear on one flipper than on the other).

(A) More females than males showed feather wear on their flippers. Penguins replace their feathers annually, so noticeable feather wear is uncommon, especially in males. (B) Of the penguins with some feather wear, right and left flippers were equally likely to have more wear (males: p ∼ 1.00, females: p = 0.42).