A cloaca In zoological anatomy, the cloaca is the posterior opening that serves as the only opening for the intestinal, reproductive, and urinary tracts. In placental mammals and most bony fishes the tracts have more than one opening.
Animals which are ovoviviparous, such as some vipers and other snakes, frogs, toads, iguanas and lizards, sharks, and fish, do what?
Which nation is believed to have more species of animals than any other country?
