However, some items, such as tagua (a nut from a South American palm used to make buttons) and
guano (bird droppings used as fertilizer), were eclipsed by postwar technology but are making a comeback because of their sustainability potential.
Juana Maria Coha Gonzales en el Boletin de la Compania Administradora del
Guano. Al Sr.
The reason certain experts tell us our money is not real is because the paper currency is not convertible or exchangeable by the government into a hard asset like gold, seashells, or bat
guano. They say that this fiat money is created out of thin air because it is not 'backed' by a hard asset.
African penguins used to nest by burrowing into a thick layer of
guano, or bird poop.
While a book about dung may not be everybody's cup of tea, this represents a treasure trove of unusual biological detail that's packed with various details about droppings, from a dung identification guide that covers
guano, frass, and scat to discussions of dung feeders, dung communities, and conflicts among dung harvesters.