According to the Museum für Naturkunde Berlin (Museum of Natural History Berlin), Grey Herons even flock to Berlin's zoos since there are abundant fish sources offered for the zoo animals. In the winter, if it gets cold enough where water freezes, herons are adaptable enough to eat small rodents, insects, or hibernating amphibians. If needed, they can migrate further south toward warmer climates.
Given their size, Grey Herons don't have a lot of natural predators, especially as they become adults. Their natural predators are golden eagles (the national symbol of Germany!) or large carnivores. Given that many Grey Herons can survive in urban environments, they don't face their natural predators very often. Instead, herons face threats from crows, gulls, hawks, and foxes when they are an egg or a small chick.
The Grey Herons in Berlin don't mind humans very much. Their still nature makes it seem like they're more nonchalant than even pigeons!
Funnily enough, there have been times where I almost run into a heron because they stand perfectly still. Mix their grey plummage with concrete and if you're not paying attention, you'll run into one!
In Germany, Grey Herons are classified as not endangered. Like most wildlife, the Grey Heron biggest enemy is humans. Trash, fishing lines, nets and plastics pose threats of entanglement, strangulation or suffocation. Though herons are incredibly adaptable, they life in environments where human waste is incredibly common, whether within a city or by riverbanks where waste gathers. Being a relatively global bird, Grey Herons have localized exceptions for endangerment.
