Deter big birds?

Don't real crocs eat turtles, fish, and the occasional biped?Crocodilians: Natural History and Conservation - Crocodiles, Caimans, Alligators, Gharials

quote:

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DIET:
Primarily fish, and other aquatic species including turtles and crabs. Also takes birds. Feeds primarily at night. Juveniles take small fish and invertebrates. Often blamed for the disappearance of domestic animals in more populated areas.

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Might be a counter-productive way to solve the heron problem.

I see a bunch of videos of heron eating koi on youtube. Many of the comments include anecdotes about fixes for the problem.