Blue whale

Balaenoptera musculus

Feeds almost exclusively on krill.

Has an almost global range; therefore, part of Peru

The blue whale is known to feed almost exclusively on krill. It has a global range of the entire world, and it is known to be the largest animal to have ever existed. With global warming causing glaciers and permafrost to melt rapidly and allowing a large amount of fresh water to flow into the oceans, there are concerns that if the amount of freshwater in the oceans reaches a critical point, there will be a disruption in the thermohaline circulation. Considering the blue whale's migratory patterns are based on ocean temperature, a disruption in this circulation, which moves warm and cold water around the world, would be likely to have an effect on their migration. The whales summer in the cool, high latitudes, where they feed in krill-abundant waters; they winter in warmer, low latitudes, where they mate and give birth.