Fig. 5. (A) Stride length (L_s) (mean ± s.e.m.) achieved by five grey-headed albatross (GHA) and 11 black-browed albatross (BBA), when walking on the treadmill at maximal speed with 0% incline (P=0.497). (B) Mean (± s.e.m.) L_s, when walking on the treadmill at a speed of 0.6 km h^–1 at maximal % incline. Significant differences can be seen between species (P=0.000). There is also a significant difference (P=0.003) in both BBA and GHA between L_s when performing on the flat (A) and on the incline (B).