Hi Rachael and Sue, No reason they do these things that we know of except they like doing it, they are extremely active little guys that jump their day away, I have one that jumps to the screen every few minutes while I'm in the room, he may want to come out, he may just be having fun, some of my others never do that, As far as the water mine will run throught it , stand in it while they drink and most of the time create the famous SAND SOUP , where the bowl just becomes a big wet gob of sand , for us to take out and clean, but they sure have fun all day doing it !!! You will notice many crazy little antics from these entertaining little and colorful lizards. Have fun watching, they always put on a show ! And congratulations on your new collared. ( I remeber awhile back I was on the gecko forum as I have a uroplatus heneli and I remeber when your crestie lost his tail ! :0( Hey have a nice weekend,
Eve