What is a unique feature of ospreys compared to other raptors regarding their toe formation?

Ospreys have a distinct toe formation that allows them to adapt effectively to their hunting lifestyle. Unlike many other raptors, ospreys have the ability to swivel their outer toes, enabling them to position two toes facing forward and two toes pointing backward. This unique adaptation enhances their grip on slippery prey, particularly fish, which is a significant part of their diet.

This toe configuration gives ospreys a superior advantage when capturing and holding onto their aquatic prey, allowing them to dive into the water with precision and then securely grasp the fish as they emerge. The ability to rearrange their toes is not commonly found in other raptors, making it a notable characteristic of ospreys that supports their role as efficient hunters in their specific ecological niche. The other options do not accurately describe the adaptations of ospreys, as they either misrepresent the number of toes or attributes that are not applicable to this raptor.