They make much more concentrated urine than we do. No, for two reasons. Our urine is fairly dilute. If try to survive by drinking sea water, will be dead within 3 days from dehydration. Eating fish not good, because loaded with protein, forcing excretion of lots of urea, loss of fluid in urine.
Muscular contractions force urine through exit tube called urethra .
About 1.5 liters of urine is produced and excreted daily. Kidneys use the second strategy Every drop of blood in your body passes through kidney 350x in one day. Each nephron starts at Glomerulus , a special structure for filtering out components of blood. If your kidneys are diseased and not working properly, the buildup of waste in your system will eventually lead to death. Some kidney diseases can be treated with medication.