Final answer:
The remora's special feature is its suction disc used for attachment to larger marine animals, which provides them with transportation, protection, and access to food.
Step-by-step explanation:
The special feature of the remora is its suction disc on the top of its head. This organ allows the remora to attach itself to larger marine animals, such as sharks, turtles, and whales. The purpose of this adaptation is for transportation, protection, and to feed on the leftovers of their host's meals. This symbiotic relationship benefits the remora and typically does not harm the host.