Birds Of A Feather Meaning

(idiomatic) People having similar characters, backgrounds, interests, or beliefs.

Example: c1710, Jonathan Swift, "A Conference," lines 11-12,
  And since we're so near, like birds of a feather,
  Let's e'en, as they say, set our horses together.
1876, Anthony Trollope, The Prime Minister, ch. 51,
  Birds of a feather do fall out sometimes.
1951, "As Bad or Worse?," Time, 21 May,
  Paul Blanshard has two bogeymen of almost equal fearsomeness: one dwells in the Kremlin, the other in the Vatican.... Blanshard has satisfied himself that Stalin and the Pope are pretty much birds of a feather.