Nor elsewhere in the US. Which is why we had a child fall into a gorilla den, and one snatched near the waters edge by a croc. BRAIN DEAD PARENTS. I used leashes on my boys that young and sure as heck would have kept a 2 year old away from an area that said danger crocs. Would not have even taken myself or dog down around there.
In mild defense of the parents it did not say “danger crocs”, it said “no swimming”. But any body of water that looks like a swamp or natural pond, I would not let a child walk in it, especially after dark. My concern would be bugs and disease, and snakes, even if I had no concern about alligators. Not to speak of unknown depth. I do think parents today seem to have some weird assumption that everything is safe unless specifically stated otherwise. The gorilla parents are a different matter entirely- never take your eyes off a child in a public place (especially like a zoo) because there are human predators everywhere. And apparently the child had already expressed the desire to play in the water within the enclosure.