The conditions the encourage whale feeding and an analysis of current models for whale movement was the purpose of the study was discussed in the study that col

The conditions the encourage whale feeding and an analysis of current models for whale movement was the purpose of the study was discussed in the study that collected the data the animation is based on. Our current best understanding is that whales are drawn to the region due to a thermal fronts in the water and concentrations of chlorophyll (from their food source) that make it easy for the whales to feed efficiently. If this is a topic that you are curious about, give reading the study a try. I don't think "armchair science" from people that don't bother to read the source material adds much value to any discussion.