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Fig. 8. Net vertical efficiency (mean ± s.e.m.) for 5 grey-headed albatross
(GHA, open circles and solid line) and 11 black-browed albatross (BBA, filled
diamonds and broken line), when walking on the treadmill with at different
percent inclines ranging between 2–12%). Regression equation for GHA:
y=–3.29x+44.04, R2=0.84, and for
BBA: y=–0.69x+22.65, R2=0.35. The
GHA data point at 9% represents only one animal; the others were unable to
perform at this level.