Hawks are characterized by their fierce-looking eyes, sharp, curved beaks, and razor-sharp talons, which aid in the capture of prey. Their coloration varies but feathers are usually some combination of black, white, and brown. Specific markings help distinguish between species. Red-tailed hawks, for example, have red markings on their tails. The standard wingspan for red-tailed hawks is about 45 inches (114 cm). Female red-tailed hawks usually weigh more than males, with the average adult weighing close to 4 pounds (about 2 kg).