Related Clues:

• Nearly unobtainable
• Like the spotted owl
• Antiquarian's adjective
• Unwonted
• Not easily found
• Few and far between
• Little-seen
• Extremely uncommon
• Coin rating
• Nearly unique in the world
• Ignoramus
• Pretty pink
• Extinct Mauritian
• Like an 1864 two cent piece
• It's been extinct since the late 17th century