Why are rosalind and celia called Juno swans in as you like it?

Juno Swans: In Greek and Roman mythology, swans drew the chariot of Venus, goddess of love. In this mythology swans were not associated with Juno whose scared birds was the peacock. On the other hand ,swans were the royal birds(those on the River Thames are still owned by the Queen),and perhaps this is why Shakespeare made a mistake and attached them to juno,queen of the gods

Rosalind and Celia called is Juno swans because these swans were always together and united just like these two cousins