Are seagulls nocturnal birds?

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Hello, animal lovers! I hope I can find an answer to my question here. For the past two nights, I heard seagulls crying over my house. I didn't watch out the window to see them, but I recognized their cries. I can also see and hear them all day long. Are seagulls nocturnal birds, or it was some abnormal behavior for those birds? I must say that I don't live near the sea, so there already is something abnormal about those seagulls.