I want to build the largest fenced black swans pond in the world.

Benefits

• I can pet the swans every day.
• Pets will have a large impact.
• It’s highly improbable that swans escape.
• The turkey will be jealous. (But only for a thousand days.)

Costs

• The fence is expensive.
• The black swans are pretty rare.
• I should consider buying grey swans. They are a good tradeoff between the balckness and the rarity.