Birds of prey make their living in different ways; Kestrels are fond of mice, Peregrines are fond of pigeons, Brown Falcons are fond of snakes. Hunting technique are appropriate to the creatures hunted.
Harriers go about their business fairly low over open country with wings upswept. In Australia we have a couple of members of the guild, Swamp Harrier and Spotted Harrier. One prefers wetter habitats the other drier habitats.
The dry plains around my home seem ideal for Spotted Harrier but for all that they are only occasional visitors. I was looking for quail when I encountered this one, so was he probably.
When looking for mice in the grass slow flight is an advantage. Kestrels and Black-shouldered Kites can hover. They are both smaller birds, there is only so much energy in a mouse and hovering is expensive. The equation works for the small birds but…
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