According to the Matangalila, Airavata was born when Brahma sang sacred hymns over the halves of the egg shell from which Garuda hatched, followed by seven more male and eight female elephants. Prithu made Airavata king of all elephants. One of his names means "the one who knits or binds the clouds" since myth has it that these elephants are capable of producing clouds. The connection of elephants with water and rain is emphasized in the mythology of Indra, who rides the elephant Airavata when he defeats Vritra. This mighty elephant reaches down his trunk into the watery underworld, sucks up its water, and then sprays it into the clouds, which Indra then causes to rain forth cool water, thereby linking the waters of the sky with those of the underworld.