The term 'Zoological Duct' refers to a type of duct found in some animals, such as the vas deferens in mammals. The vas deferens is a tube that carries sperm from the testes to the urethra during ejaculation. It is also known as the ductus deferens or the sperm duct. In other animals, such as birds and reptiles, the zoological duct is a tube that carries urine from the bladder to the cloaca. In both cases, the zoological duct plays an important role in the reproductive system of the animal.