Once within reach, mantises strike rapidly to grasp the prey with their spiked raptorial forelegs. They have strong legs and feet with raptorial claws and opposable hind claws. Members of the collector guild browse the sediments, picking out specific particles with raptorial appendages. Common buzzards are occasionally threatened by predation by other raptorial birds. Distinguishing territorial exclusionary behavior and anti-predator behavior is difficult in raptorial birds. Bonelli's eagles, like most but not all raptorial birds, generally lives solitarily or in pairs. Like most raptorial birds, it mainly lives solitarily or in a breeding pair. However, the greatest predatory impact (perhaps alongside domestic cats) is probably from raptorial birds. As a large raptorial bird, the black kite has few natural predators. In general, great horned owls rarely engage in siblicide, unlike many other raptorial birds. Other larger raptorial birds can threaten them. Like all raptorial birds, Verreaux's eagle-owls are strongly territorial. There are reports of Verreaux's eagle-owls attacking even larger raptorial birds. Overall, 28 raptorial bird species are known to hunt robins. "Brygmophyseter" is the oldest raptorial.