Assertion: tawny owl's prey | /r/AtLocation | mass
Facets:
value: south
type: LOCATION
Source sentences:
text: These erratic movements and peaks and ebbs of northern populations has lent to descriptions of the long-eared owl as “irruptive”, however it generally moves in quite different ways from owls largely endemic to the taiga (or tundra), which are more traditionally irruptive in that they tend to migrate little or not at all when prey remain ample in their native home range but then move south in mass when prey populations crash.