Rabbits have a unique way of dealing with calcium in their bodies. Unlike most animals, they absorb almost all the calcium they eat and get rid of the extra through their urine. This means their blood calcium levels depend on what they eat. The article talks about how hormones like parathyroid hormone and calcitonin, along with vitamin D, play a role in this process. It also discusses how this special calcium metabolism in rabbits can lead to health issues like kidney stones and dental problems.