I am not sure if they need to .... but my snakes love to soak. Especially after they eat. I have gladware containers in my rack. They all ate last night (700g and ate a 45g rat; not very big prey) and low and behold, they are all sitting in their bowls this morning. Humidity is 60 and temps are 90/80. I have covers on my bowls, and maybe the treat it as third hide.....but whatever the reason, that is how they roll!