Using monochrome

Having discovered the Monochrome setting on my camera, and still puzzled by the interaction of tone and hue, while waiting for the train I wondered how the tone of the fresh green leaves would match up to the clear blue sky -Well they don't, really - maybe in summer? - but the clarity of the original photo, downloaded, astonished me.

And it's interesting to try to "see" in black and white.
These ducks, however, were photographed in colour, into the glare -