Re: Is there an animal that stores liquid water separate from its circulation?

Dear Michael,
Marine fish use their hyper-osmotic blood to draw in water, while
freshwater fish have to maintain the hypo-osmotic condition to avoid
flooding. The swim bladder is never involved as far as I know.Your search
for an actual organ containing water could include the Australian desert
frog, which uses its whole body to absorb water within two minutes, when in
its dessicated, dry-season condition. Aborigines use them for drinking
water. In this context, I imagine the Anuran bladder could be regarded as
your water container. Frogs use it for resorption, just as you (and other
mammals) resorb in a discriminating fashion from the colon. The size of
insects probably restricts their capacity to retain much water, but they
have similar absorptive abilities to the frogs. The mealworm, Tenebrio
molitor is your best example.