To flock to something describes the movement of large groups of people towards a destination.
Thousands of people flocked to the shopping centre when the mega-sale started.
Youngsters flock to cinemas to watch the latest blockbuster action movies.
Birds of a feather flock together is an expression which means that people who are similar or have similar interests tend to be close or support each other.
Dictatorial presidents tend not to criticise each other’s regimes. Birds of a feather flock together.
Starlings fly in their millions and offer spectacular displays during winter. But there are not as many around nowadays. Once a common sight in both urban and rural areas of Britain, starling numbers have dropped by a staggering 92% in woodlands.