Amazon birds shrink but grow longer wings in sign of global heating

Some species in Brazil have shrunk by nearly 10% over 40 years of measurements, say researchers

Birds in the Amazon are becoming smaller but growing longer wings, a study has found, with scientists saying global heating is the most likely explanation.

Several recent papers have reported birds getting smaller, but as their subjects were migratory birds there were many confounding factors that could have explained the results, such as hunting, pesticide use or habitat loss.