Vigorously protective of their nests, ravens have been known to drop sticks and stones on intruders who get too close. A scientist may consider, however, if this bombing is intentional or just the side effect of a nervous corvid picking at a tree? Such missiles are a last resort—more often ravens will fly overhead hoping to drive the trespasser away with raucous “kaawing” and a vociferous wing-flapping as if to say, “Get out of here!”