In urban areas, gardens and parks can provide green oases among the concrete, and birds are adapted to fly in and settle in these areas. But not all green spaces are the same.
You can read the post at https://botany.one/2022/09/native-plants-in-urban-settings-can-improve-bird-diversity/
You can read the original research at https://doi.org/10.1007/s42965-022-00269-3