The BBC has an article on urban habitat for bees:

There is widespread concern that wild bee populations in rural areas are being adversely affected by a number of factors, including pesticides.

“For a bee species to be present in [an urban] habitat, it must be able to find food and nesting substrate,” said co-author Laura Fortel, a researcher from the French National Institute for Agricultural Research (INRA).

“Urban and periurban (the transition between rural and urban) sites can provide high quantities of flowers all year long; they show a high diversity of land cover types and are often warmer than surrounding landscapes.”

She added: “Also, such habitats are seldom treated with pesticides, which are involved in the decline of bees elsewhere.”

It seems like a reversal of conventional wisdom that cities could be important reservoirs of biodiversity when rural agricultural areas have become degraded. In a way it is a negative story, but in another way it is reminder that we should not cynically assume that urban landscapes are always biological dead zones. There is a lot we can do to make them much more ecologically functional for important species of pollinators and birds. If it is happening to some extent by accident, then it could work even better if we did it by design. We can think about how the individual small patches are designed, then think about how they can connect better to each other, to larger urban parks, and to the rural landscape.