Which of the following defines a 'raptor'?

The definition of a 'raptor' specifically refers to birds of prey that are adept hunters, characterized by their keen eyesight, strong talons, and curved beaks. Raptors belong to two primary orders: Falconiformes, which includes falcons, and Strigiformes, which encompasses owls. These characteristics enable them to hunt and feed on other animals, making them distinct within the avian world.

In contrast, the other options do not align with this definition. For instance, migratory birds from the Order Passeriformes typically include songbirds, which are not designated as raptors due to their feeding habits and physical adaptations. Domesticated birds, regardless of species, are bred and kept for companionship, which again does not pertain to raptors. Lastly, flightless birds, while interesting in their own right, are not categorized as raptors either, especially those found specifically in Texas, which might include species that lack the predatory traits associated with raptors. Thus, option B accurately encapsulates the essence of what defines a raptor in ornithology.