Why is the actual population density of the Eurasian eagle owl inherently low compared to smaller bird species?

Answer

A single breeding pair requires an enormous territory to find enough food.

The owls require substantial tracts of land, meaning that even where locally common, their population density (birds per square kilometer) is low because a single breeding pair needs an enormous territory.

Why is the actual population density of the Eurasian eagle owl inherently low compared to smaller bird species?
raritybirdwildlifeowlEurasian Eagle-owl