Jellyfish

There are about 200 marine lakes in the world, part salt water and part fresh, and so-called stingless jellyfish have evolved in several of them. Without any ocean predators around, the jellyfish no longer needed its natural defense system and its sting evolved into one so weak that people don’t feel it.  The largest known and most famous of these lakes is in Palau, but there are several smaller ones in Indonesia as well.  They are extremely fragile, but we had a chance to carefully swim with them during our visit.