1a dilemma where it's impossible to determine which of two closely related events came first
chicken and egg situation
2what you do in the past will eventually catch up to you
chickens come back to roost
3become more independent
spread one's wings
4a final, beautiful performance or gesture
swan song
5гадкий утенок
ugly duckling
6destroy a reliable and valuable source of income.
kill the goose that lays the golden egg
7no longer effective, valid, or interesting
as dead as a dodo
8something is very easy to do or accomplish
as easy as duck soup
9completely free, with no worries or obligations, and able to do whatever one wants
as free as a bird
10as graceful as a ...
swan
11as happy as a ...
lark (жаворонок)