Leviathan, ziz, and behemot are not the only monsters; there are many others, and marvellous ones, like the reem, a giant animal, of which only one couple, male and female, is in existence. Had there been more, the world could hardly have maintained itself against them. The act of copulation occurs but once in seventy years between them, for God has so ordered it that the male and female reem are at opposite ends of the earth, the one in the east, the other in the west. The act of copulation results in the death of the male. He is bitten by the female and dies of the bite. The female becomes pregnant and remains in this state for no less than twelve years. At the end of this long period she gives birth to twins, a male and a female. The year preceding her delivery she is not able to move. She would die of hunger, were it not that her own spittle flowing copiously from her mouth waters and fructifies the earth near her, and causes it to bring forth enough for her maintenance. For a whole year the animal can but roll from side to side, until finally her belly bursts, and the twins issue forth. Their appearance is thus the signal for the death of the mother reem. She makes room for the new generation, which in turn is destined to suffer the same fate as the generation that went before. Immediately after birth, the one goes eastward and the other westward, to meet only after the lapse of seventy years, propagate themselves, and perish.[144] A traveller who once saw a reem one day old described its height to be four parasangs, and the length of its head one parasang and a half.[145] Its horns measure one hundred ells, and their height is a great deal more.[146]