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Figure S1 Stable hydrogen (δD) and carbon (δ13C) isotopic values along two claws of the Saskatoon cougar – 41 mm long (white) and 49 mm long (black).

Figure S2 Stable hydrogen and carbon isotopic values measured in claw samples and expected along each dispersal corridor. For each cougar, we determined the expected stable isotopic values along each corridor Ωr (lines) by adding the cougar-specific discrimination factor to isotopic values extracted from the regional δD and δ13C isoscapes (for the Gretna and Valentine cougars) or large-scale δD isoscape (for the Chicago and Saskatoon cougars). We considered a mean speed of 3 km/day (which corresponds to a mean distance of 5 km integrated per 1% of claw) for the Valentine and Chicago cougars, and 5 km/day (7.5 km/% of claw) for the Gretna and Saskatoon cougars. For each cougar, δDclaw at i =1.0 corresponds to the mean δDclaw in samples i ≥ 0.85 (proximal part of the claw). The unexpectedly low measurements in the tip and the root samples of the Chicago cougar were not considered in the analysis and are not shown on this graph (see text for details). Note variations in y-axis values among graphs.

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