Something we have, or can easily get, is more valuable than something we want that we may not be able to get; we shouldn't risk losing something sure by trying to get something that is not sure. A proverb. Johnny has a job as a paperboy, but he wants a job in a gas station. His father says that a bird in the hand is worth two in the bush.
BIRD IN THE HAND IS WORTH TWO IN THE BUSH (A)
Meaning of BIRD IN THE HAND IS WORTH TWO IN THE BUSH (A) in English
American idioms English vocabulary. Английский словарь американских идиом. 2012