The most common and most likely answer to this crossword clue is the 8 letter word STARLING
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More clues leading to the result STARLING
Buddy explains!

The straight part
We know that "bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bird = starling.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does STARLING mean?
STARLING noun- A family, Sturnidae, of passerine birds.
- A structure of pilings that protects the piers of a bridge.
- A California fish, the rock trout, Hexagrammos, especially, Hexagrammos decagrammus, the boregat or bodieron.