Bears are quite different from most hibernating mammals. They don't awaken and feed any time during their
hibernation and seem to virtually shut down many of their biological systems. One system which shuts down almost entirely
is the kidneys.
Once bears hibernate they cease to urinate. The blood supply to the kidneys is greatly reduced and all fluid movement
in the kidneys virtually ceases. One would expect such a stoppage to damage the kidneys and produce all kinds of toxic conditions
in the body, but this does not happen. Blood measurements show no measurable changes in the chemical make-up of the blood
and no accumulation of waste products.
What a tremendous advantage this shut-down has to the bear. Not only does it rest the kidney and conserve energy
consumption in the bear, but it also eliminates dehydration. If the bear released water and did not replace it, he would eventually
die. In the deep sleep of hibernation, there is no way to replace the water.
Hibernation is a beautiful and obviously very complex way of conserving energy, protecting the bear, and protecting
his potential food from over-consumption. The design and plan of such a system shows incredible wisdom. This could not have
happened by accident, but it shows God's incredible design.