It does not determine where it finds food at all. The closest thing an owl's wingspan size could relate to that is what kind of prey it eats. A smaller owl, such as a Pymgy or Elf owl, could not eat an entire rabbit by its self. A larger owl, such as a Great Gray or Great Horned owl, could.
It's probably referring to episode 29- The Pyg Chill. If so here is the list:16 Episode Tasks:Visit Ice IslandDrop Pygmy in igloo (activate from menu)Fire Pygmy from Igloo (drop 2 pygmies into igloo)Drop Fish in igloo (2 ways here… drop fish in after pygmy and drop fish in without a pymgy)Pygmy Crawls into igloo to eat fish (There must not be a Pygmy in the igloo… to make him leave tap the igloo like knocking on a door).Pygmy crawls out of iglooPygmy eats fish in iglooDrop two pygmies in igloo to fire one pygmy out of doorPygmy hit by pygmy flying out of iglooRaise the ice monster (activate in menu, flick pygmy on ice rock to make monster rise)Pygmy killed by snow ball (flick pygmies at monster to make him mad and throw snowballs)Defeat the ice monsterFlick Pygmy and bounce off ice monsterFlick Pygmy and explode on ice monsterFlick a Pygmy into the monster's mouthMake the ice monster dizzy