What triggers the shift towards smaller, more frequent meals, such as lemmings, during the brief Arctic summer?

Answer

A sharp increase in lemming and small rodent populations

The heightened activity of small rodents during the summer allows wolves to subsist on smaller, easier targets, reducing the immediate pressure associated with hunting large prey.

What triggers the shift towards smaller, more frequent meals, such as lemmings, during the brief Arctic summer?
animalArcticwolfCarnivore