Final answer:
Border Collies excel in the 'stalk' part of the predatory sequence due to selective breeding for herding purposes, allowing them to control and protect livestock effectively.
Step-by-step explanation:
Border Collies were bred specifically for their herding abilities, showcasing expertise during one part of the predatory sequence known as the stalk. This behavior allows them to guide and protect the herd by keeping animals rounded up and directing them away from danger. The selective breeding process focused on moderating the natural predatory sequence that consists of eye, stalk, chase, and bite, enhancing their ability to control and manage the movement of herds without harming them.