'Personality Gene' Makes Songbirds Curious: Exploratory Behavior In Great Tits, ScienceDaily
Whether you are an anxious type, or a fearless person - such individual differences in personality could be partly due to the genes you carry. In humans, it is hard to prove the existence of such "personality genes" - there are simply too many factors that influence human behaviour and these factors are hard to control experimentally. Birds are an easier target for research and indeed, they also have different personalities. (...) researchers have now found evidence for the existence of a "curiosity-gene" in a songbird, (...). The gene (Drd4) carries the building instructions for a receptor in the brain, (...).