What is the normal quarry for the peregrine falcon?

The peregrine falcon is known for its exceptional hunting abilities and is particularly adept at preying on birds. The typical quarry for this species primarily includes medium-sized birds, which often consist of waterfowl, pheasants, and grouse. These prey items align with the peregrine falcon's hunting strategies, leveraging high speeds and agility to capture these birds in flight.

In contrast, while starlings and English sparrows can also be part of a peregrine's diet, they are not as central to their typical quarry when compared to the aforementioned prey. The selections that refer to only starlings and English sparrows do not encapsulate the broader spectrum of their usual hunting targets. Therefore, the answer that specifies waterfowl, pheasant, and grouse is the most accurate representation of the peregrine falcon's normal quarry.