Study finally proves birds are more colourful near the Equator

Study finally proves birds are more colourful near the Equator (University of Sheffield/NHM Tring)

Birds that live near the equator are more colourful than those closer to the poles, a new study suggests.

The findings prove a long-held theory that was first suspected by Charles Darwin and Alexander von Humboldt in the 18th and 19th centuries.