The most common and most likely answer to this crossword clue is the 8 letter word SEAGULLS
I've seen this crossword clue in The Guardian
S
E
A
G
U
L
L
S
Buddy explains!

The straight part
We know that "birds /birds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case birds /birds = seagulls.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 SEAGULLS mean?
SEAGULLS noun- Any of several white, often dark backed birds of the family Laridae having long pointed wings and short legs.
- The symbol ̼ , which combines under a letter as a sort of accent.
- A fan or member of Brighton and Hove Albion Football Club.