Hi John,
Electric fences won't contain crocodilians. The move right through them, they get shocked and react but go forward rather than backward. They also don't seem to make a lasting association although I suppose that could be experimented with by someone.
Electric fence is a very humane way to contain animals, but not this kind of animal.
How do I know this you ask? I happened to keep other livestock years ago and the crocodilians tested the fencing.
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CDieter
'Reason, observation, and experience; the holy trinity of science.'