One option is to paint the hardwarecloth black. That will render it MUCH less visually obtrusive, and illogical though it sounds, your eye WILL be able to see your chickens (edit: er, I mean ducks
) far more clearly that way. I suggest using a roller not a brush nor spraycan. It will flake off in time, but is easy enough to reapply. Some people recommend a brief acid rinse (vinegar or a stronger acid) to slightly etch the galvanized coating on your wire so the paint sticks better; I don't do this and don't necessarily recommend it, but am passing the idea on since some DO
If you decide instead to replace a section with plexiglass, make sure it is backed up by something pretty strong (edited to revise post since now I realize you've got chainlink in place, which
is plenty strong enough
)
You might want to try black paint first, see how that works for you. If it doesn't, you haven't lost hardly anything; but if it DOES, it is certainly way less work and expense than plexiglass
Another option, depending on your local predator load and your personal philosophies about risk, would be to replace that section of hardwarecloth with 1/2" plastic garden netting. It will keep the ducks' heads on the right side of the fence. A determined raccoon would have no trouble ripping through it however and I would not rely on it if you require protection vs *that*.
Good luck, have fun,
Pat