Let's have a little fun today and explore a fascinating human phenomenon:  Flock (verb):  to move or come together in large numbers. 
Seemingly without warning coin collectors flock towards a
specific series of coins.  This
interesting direction change often occurs suddenly, sometimes over a month or
less.  It’s as if some special collector sense has become activated.
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| Flock (or murmuration) of birds www.telegraph.co.uk  | 
Let’s examine one example:
