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The experimental set-up for the determination of olfactory detection thresholds of harbour seals for dimethyl sulphide (DMS) (left, schematic; right, photograph). (a) Discharging apparatus with syringe. (b) Board. (c) Latex lining closely fitting the muzzle. (d) Response target. (e) Jaw-station. The photograph shows the seal Nick sniffing with nostrils (f) wide open.
