Which raptor can grip with two claws in front and two claws behind?

The osprey is the correct choice for this question because it has a unique foot structure that includes a reversible toe, allowing it to grip with two claws in front and two claws behind. This adaptation is particularly beneficial for catching and holding onto slippery fish, which is the primary diet of the osprey. The opposable toe enables a strong and secure grip, ensuring that when the osprey catches its prey, it can firmly hold onto it while in flight or when returning to its perch.

In contrast, other raptors like the gyrfalcon, bald eagle, and ferruginous hawk do not possess this feature. These birds have a more typical arrangement of talons that does not allow for the same degree of versatility in gripping, particularly with respect to catching fish. Their foot structure is optimized for different hunting techniques, such as hunting birds or small mammals, rather than specializing in fish-catching strategies like the osprey.