Social facilitationLearning through observation and imitation of others, also called 'local enhancement'. This phenomenon is best seen when a new habit is learned and spreads from one population to another, for example the opening of milk bottles on doorsteps by tits (family Paridae) in order to drink the cream, a habit first reported in Southampton in 1929 and now widespread.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver