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 simplicity, answers should be in all lower cased letters.

Category: PREHISTORIC TIMES 
Clue: The Stone Age lasted until this metal replaced stone as the primary tool-making material
bronze

Category: PERSONAL FOWLS 
Clue: The Greek goddess Hera was associated with (& probably proud as) this showy bird, Pavo muticus
a peacock

Category: NATURE 
Clue: Like whales, manatees have a layer of this fat under their skin

blubber