Meaning of the word "a carrion kite will never be a good hawk" in English

What does "a carrion kite will never be a good hawk" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a carrion kite will never be a good hawk

US /ə ˈkɛriən kaɪt wɪl ˈnɛvər bi ə ɡʊd hɔk/
UK /ə ˈkæriən kaɪt wɪl ˈnɛvə bi ə ɡʊd hɔːk/
"a carrion kite will never be a good hawk" picture

Idiom

a person of low character or poor upbringing will never truly become noble or excellent, regardless of their outward appearance or status

Example:
He tried to act like a gentleman, but his true nature showed; a carrion kite will never be a good hawk.
You can't expect high-quality work from someone with no integrity; a carrion kite will never be a good hawk.