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No, they aren't real animals. Here's a wiki link for it. Its one of those things people like to tell tourists to watch out for so they'll look stupid.
There was a TV show called SAS Survival Secrets a few years back and one of the guys carried a regular condom in his emergency pack and showed how he could use it as an emergency hydration pack/bottle. I think he was able to put about 2L of water in it.
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