With accent marks:
Видна́ пти́ца по полёту.
A bird is visible by its flight.
You can say anything about yourself, but only your actions will show your true value. A person is judged not by his words, but by his deeds.
The closest English equivalent is "A bird may be known by its song".
Other Russian proverbs
Silent means consent.
Who is talking about what, and a lousy one about the bath.
Fear has big eyes.
Live for a century, learn for a century, but die being a fool anyway.
A wolf is fed by his legs
A titmouse in hands is better than a crane in the sky.
Repetition is the mother of learning.
Оne sees the mote in another's eye and ignores the log in his own.