` I think it is a matter of each individual snake, whether Yellow or Green. The water gives them security, especially when young. They seem to feel invisible under the water. All of the Yellows and Greens I've kept have matured into adults that just flop wherever they get tired. They no longer care about hide areas. I have one big male who likes to be half in, and half out of the water. Sometimes he coils in a branch with a few feet of him hanging in the water. It seems that, when given water, they spend equal amounts of time out, and in.
` For many babies, and some adults, the water can reduce stress. If you're keeping them in an environment with little stress, the water becomes less important. The thing about the water is that if you don't have time to keep it clean, really clean, you can end up with some nasty health problems. Another thing about water is that a heated water container, in a properly sealed and ventilated cage, provides necessary humidity.
` If you are giving them a place to soak, it doesn't have to be big. They prefer cramped quarters. I've experimented with large, and small containers that they just fit into, in the same habitat. They pick the cramped quarters every time.
` You often hear that Yellows are more aquatic than Greens. I don't think so. You often hear that Greens will blister if in the water too much. I think that is caused by the condition of the water, and by not having dry substrate available. That's why newspaper is so practical.
` I think that if I were keeping many cages of Anacondas, I would probably try them without water. Or, hire somebody to clean water containers. I have 6 large water containers to clean. A few more would make it too many for me to keep up with. However, I have a system with a high pressure nozzle with hot water, and vinegar and hydrogen peroxide in separate spray containers, with a bristle brush. I can do all six in a half and hour. It's quite a drill.
` In this pic, you can see that there is an empty water container next to the one with the two snakes in it. That's 22 or so feet of Anacondas in that tub, which is 21" x 13" x 6". They'd rather be stuffed into one, than be roomy in separate tubs.

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