A simple chemical test for glucose sugar in the urine will indicate whether someone has diabetes or not. Any sort of home that has to be built from scratch could be called a building. But most people use the word strictly for man-made structures and have in mind something rather larger than a wasp's nest. The sort of birds that live in European cities are feral pigeons, house sparrows, blackbirds, starlings. In London there are kestrels as well, and quite wide range of other birds that inhabit the gardens and parks.
Many birds are visitors, passing through on their migrations.
Wherever there is an ornamental lake, ducks, geese and swans will come, and near tidal rivers or seashores, there are gulls and other seabirds. Birdlife in cities can be quite varied. Different varieties of maze are used for different purposes. What is best for feeding livestock is not the best sweet corn for the table. Maize is used to make cornflakes, tortilla chips, cornflour, popcorn and other foods.