Seagulls are protected under the “Migratory Bird Treaty Act of 1918”. This means that it is illegal to capture, kill, or keep a seagull in your home (unless you have a special permit).
So, no: you cannot go into the Meijer parking lot, yoink a seagull from the flock, and take it home.
This PSA has been brought to you by an argument with my son during a grocery pick-up.
Thank you.
Wild ducks are also protected.
Domestic ducks, however, if they are not owned by anyone, are free for the taking.