The Northern Harrier aka the Marsh Hawk flies low by gliding over a marsh or grassland when hunting. It has an owlish face that helps it to hear mice and voles beneath the vegetation. All Northern Harriers have a white rump that it’s visible when they fly.
A male Northern Harrier aka the Grey Ghost is known to have an average of 3 female mates at any one time. Some even have up to 5. And as the sole food provider for its mates and offspring, the dude stays VERY busy. Imagine if he has 3 active nesting and each one has 3 chicks—that’s 9 chicks with 3 extra mouthes to feed on top of that.