It once happened that travellers on a vessel noticed a bird. As he stood in the water, it merely covered his feet, and his head knocked against the sky. The onlookers thought the water could not have any depth at that point, and they prepared to take a bath there. A heavenly voice warned them: "Alight not here! Once a carpenter's axe slipped from his hand at this spot, and it took it seven years to touch bottom." The bird the travellers saw was none other than the ziz.[132] His wings are so huge that unfurled they darken the sun.[133] They protect the earth against the storms of the south; without their aid the earth would not be able to resist the winds blowing thence.[134] Once an egg of the ziz fell to the ground and broke. The fluid from it flooded sixty cities, and the shock crushed three hundred cedars. Fortunately such accidents do not occur frequently. As a rule the bird lets her eggs slide gently into her nest. This one mishap was due to the fact that the egg was rotten, and the bird cast it away carelessly. The ziz has another name, Renanin,[135] because he is the celestial singer.[136] On account of his relation to the heavenly regions he is also called Sekwi, the seer, and, besides, he is called "son of the nest,"[137] because his fledgling birds break away from the shell without being hatched by the mother bird; they spring directly from the nest, as it were.[138] Like leviathan, so ziz is a delicacy to be served to the pious at the end of time, to compensate them for the privations which abstaining from the unclean fowls imposed upon them.[139] THE SIXTH DAY As the fish were formed out of water, and the birds out of boggy earth well mixed with water, so the mammals were formed out of solid earth,[140] and as leviathan is the most notable representative of the fish kind, and ziz of the bird kind, so behemot is the most notable representative of the mammal kind. Behemot matches leviathan in strength, and he had to be prevented, like leviathan, from multiplying and increasing, else the world could not have continued to exist; after God had created him male and female, He at once deprived him of the desire to propagate his kind.[141] He is so monstrous that he requires the produce of a thousand mountains for his daily food. All the water that flows through the bed of the Jordan in a year suffices him exactly for one gulp. It therefore was necessary to give him one stream entirely for his own use, a stream flowing forth from Paradise, called Yubal.[142] Behemot, too, is destined to be served to the pious as an appetizing dainty, but before they enjoy his flesh, they will be permitted to view the mortal combat between leviathan and behemot, as a reward for having denied themselves the pleasures of the circus and its gladiatorial contests.[143]