Which of the following best defines a "bird of prey" or "raptor"?

The best definition of a "bird of prey," or "raptor," is indeed a bird with powerful taloned feet for grasping and killing. Raptors are characterized by their physical adaptations that allow them to hunt effectively. This includes not only their talons, which are essential for catching and holding onto prey, but also their strong, hooked beaks designed for tearing flesh. These adaptations are crucial for their survival as they primarily feed on live animals, making them distinct in the avian world.

While the other definitions touch on aspects of raptors, they do not encompass the defining features as accurately. For example, simply stating that any bird that preys on other living creatures might include birds that do not possess the specific adaptations of a raptor. Additionally, limiting the definition to just members of the Order Falconiformes excludes other raptors, like eagles and hawks, while focusing solely on the Order Strigiformes would exclude all diurnal birds of prey. Thus, the defining characteristic provided in the correct answer highlights the fundamental traits that make raptors unique within the bird classification.