You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: ANIMALS 
Clue: Types of this aquatic creature include chimney, sheep's wool, and common bath
the sponge

Category: TRANSPORTATION 
Clue: In the 19th century Gustavus Swift developed this type of railway car to preserve his packed meat
refrigerator car

Category: ISLAND HOPPING 
Clue: This South Carolina site serves as the major east coast training base for the Marine Corps

parris island