Kidney always so simple; in cartilaginous fish and some amphibians, there is also a shorter duct, similar to the amniote ureter, which drains the posterior (metanephric) parts of the kidney, and joins with the archinephric duct at the bladder or cloaca. Indeed, in many cartilaginous fish, the anterior portion of the kidney may degenerate or cease to function altogether in the adult. In the most primitive vertebrates, the hagfish and lampreys, the kidney is unusually simple: it consists of a row of nephrons, each emptying directly into the archinephric duct. Invertebrates may possess excretory organs that are sometimes referred to as
Bladder Festival Bladder Festival The Bladder Festival or Bladder Feast ("Nakaciuq" "something done with bladders" or "Nakaciuryaraq" "the process of doing something with bladders" in Yup'ik), is an important annual seal hunting harvest renewal ceremony and celebration held each year to honor and appease the souls of seals taken in the hunt during the past season which occurred at the winter solstice by the Yup'ik of western and southwestern Alaska. On the Yup'ik Eskimo shamanism, while the hunter kills the body of the animal, he does not kill the "yua" (spirit or soul), which resides in the animal's bladder ("nakacuk" in Yup'ik)