Fig. 3. An animation showing variation in predicted density of humpback whales. Each frame of the animation reflects an iteration of jackknife resampling: the removal of one trip’s effort and sightings data; refitting the detection function on the remaining sightings; reevaluating size-bias corrected estimates of mean school size; refitting the spatial model; and prediction across the grid. White patches within the regions of high density reflect grid squares predicted to have >0.22 humpback whale schools/nm2. The longest axis of the prediction grid (from the southern tip of South America to the northern tip of the Antarctic Peninsula) is approximately 500 nm long. Note that, although the scale of the density gradient varies among iterations, the placement of the highest-density area along the western Antarctic Peninsula is consistent.