Cignoni non sine causa Apoloni dicati sint, quod ab eo divinationem habere videantur, qua providentes quid in morte boni sit, cum cantu et voluptate moriantur. The swan is not without cause dedicated to Apollo because, foreseeing his happiness in death, he dies with singing and pleasure. CiceroTusculanarum Disputationum. I. 30.
And over the pond are sailing Two swans all white as snow; Sweet voices mysteriously wailing Pierce through me as onward they go. They sail along, and a ringing Sweet melody rises on high; And when the swans begin singing, They presently must die. HeineEarly Poems. Evening Songs. No. 2.
You think that upon the score of fore-knowledge and divining I am infinitely inferior to the swans. When they perceive approaching death they sing more merrily than before, because of the joy they have in going to the God they serve. Socrates. See PlatoPhaedo. 77.
The stately-sailing swan Gives out his snowy plumage to the gale; And, arching proud his neck, with oary feet Bears forward fierce, and guards his osier isle, Protective of his young. ThomsonThe Seasons. Spring. L. 775.