In 2011, a couple bought a box of textbooks for $10. Inside, they found a 25-cent bill signed by the president of the Republic of Texas, Sam Houston, and subsequently sold it for $63,250.
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Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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Passengers on the Beijing subway can pay with plastic bottles.
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Some farmers in Kenya are using elephants' natural fear of bees and building "beehive fences" that keep wild elephants from trampling the crops. It keeps the farms safe, and prevents farmers from having to kill elephants to defend their livelihood!
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In Mexico, artists can pay their taxes using artwork that they create.
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Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
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