I am surprised and disappointed at a vet for giving that suggestion. As with all cases involving chicks falling out of nests (or equivalent), the advice is the tried and tested, 'return it to its parents'. No nest site is 100% safe. With apparently both parents around, it is clear cut what needs doing. Getting large gulls (I am guessing this is a herring gull) familiar and comfortable with humans will only end in bad news for the gulls. Obviously, if it is clearly injured it is the a dilemma where the alternative is being put down.
In reply to Robbo:
Is it an only chick? Sleepy could be a sign of stress I guess.
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