An enlarged dorsalspine accommodates additional avionic for the second pilot.
放大以适应增加的武器装备和第二位飞行员。
2
Their most distinctive feature, worn only by females, is a piece of dorsalspine that protrudes above their mouths like a fishing pole—hence their name.
It thumps the catch against the branch to stun it-a lesson some young birds learn only after swallowing a stickleback that erects its dorsalspine on the way down.