Grey seals use anthropogenic signals from acoustic tags to locate fish: evidence from a simulated foraging task.

The interaction term of box type (presence of the tag) and trial number approached significance in the standard model and became highly significant in the model when a single extreme outlier was removed (electronic supplementary material).

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The mixed model showed a highly significant effect of trial number with a reduction in time and number of boxes visited before retrieving the fish over consecutive trials (GLMM, table 1 ).

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