Black-and-white dolphins (5)

I believe the answer is:

orcas

'black-and-white dolphins' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for orcas that I've seen before include "Killer whales" , "Killers" .)

I've seen this clue in the Newsday and the Newsday.com.

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