Not normally.The harrier is a bird of grasslands and meadows.It usually feeds on rodents and small birds.But as most predators,it is a creature of chance,and would not turn down an injured duck if...
it is an omnivore
The Peid harrier eats frogs, lizards, ground birds and insects.
Rodents mainly, but will take reptiles or amphibians as well.
A Northern Harrier Hawk can eat grass, but prefers fresh meat, unless food is very scarce and it has no other option.