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Fig. 8. Dive behaviour associated with shallow (open columns) and deep (filled columns) diving and after exposure to different levels of O2 (N=5 birds) and CO2 (N=4 birds). Values are means + S.D. from 10 dive cycles per bird. *Significantly different from the respective control (air) values. {ddagger}A significant difference between ‘shallow diving’ and ‘deep diving’.