You have some talented snakes there! Isn't it odd that even some desert species are good at this? Maybe it has more to do with their overall skills & vision. It's like when you train some dogs, & put an item under something else, some catch on & search for it, but to others, it's just "gone". And I know exactly what you mean about them polluting their water bowls right after they've been changed. Mine do that too.
Snakes!
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