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One version of the Latin text of the Physiologus reads:
"There is a monster in the sea which in Greek is called aspidochelone, in Latin "asp-turtle"; it is a great whale, that has what appear to be beaches on its hide, like those from the sea-shore. This creature raises its back above the waves of the sea, so that sailors believe that it is just an island, so that when they see it, it appears to them to be a sandy beach such as is common along the sea-shore. Believing it to be an island, they beach their ship alongside it, and disembarking, they plant stakes and tie up the ships. Then, in order to cook a meal after this work, they make fires on the sand as if on land. But when the monster feels the heat of these fires, it immediately submerges into the water, and pulls the ship into the depths of the sea.There are several versions of the birth of the winged stallion and his brother Chrysaor in the far distant place at the edge of Earth, Hesiod's "springs of Oceanus, which encircles the inhabited earth, where Perseus found Medusa:
One is that they sprang from the blood issuing from Medusa's neck as Perseus was beheading her,[6] similar to the manner in which Athena was born from the head of Zeus. In another version, when Perseus beheaded Medusa, they were born of the Earth, fed by the Gorgon's blood. A variation of this story holds that they were formed from the mingling of Medusa's blood and sea foam, implying that Poseidon had involvement in their making. The last version bears resemblance to the birth of Aphrodite.
Pegasus was not immortal. Because of his faithful service, Zeus honored him with a constellation. On the last day of his life, Zeus transformed Pegasus into a constellation.