Pigeon Towers: A Low-tech Alternative to Synthetic Fertilizers

Pigeon Towers: A Low-tech Alternative to Synthetic Fertilizers

Many societies, ancient and contemporary, have innovated ways of supplying their fields with fixed nitrogen and phosphorus—two crucial ingredients for crop productivity. One is crop rotation, which alternates nitrogen-fixing and nitrogen-exhausting crops. Farmers around the world make use of chickens, ducks, and geese to add 

What an Extinct Bird Re-Evolving Says About “Species”

What an Extinct Bird Re-Evolving Says About “Species”

You may have heard the news of what sounds like a resurrection story on the small island of Aldabra, off the coast of Madagascar. Around 136,000 years ago, the island was submerged in water and a layer of limestone captured the rails—a species of flightless 

BLUE MAGPIE

BLUE MAGPIE

BLUE MAGPIE Taiwan blue magpie, photo by Su Min Du