The "bird hallway" is the second of two indoor areas of the zoo. All of these cages are remnants of the old pet store and easily the poorest exhibits in the zoo. Some (but far from all) of the birds do have outdoor aviaries in the courtyard and on the lawn, though.
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Dyrenes Verden Filskov is one of the newest animal-related attractions in Denmark, opened in 2019. Dyrenes Verden (in English: "The world of animals") is actually a chain of pet stores, but when the branch in Filskov - a village in Central/Southern Jutland - was handed over to its current owner, he decided to turn part of it into a tiny zoo with entry.
Dyrenes Verden Filskov doesn't yet have a zoo license, so they only keep animals that private households are allowed to keep here in Denmark, but it's run by trained zookeepers so the expertise is higher than in many similar places, and there are many exotic species that you rarely see elsewhere in Danish zoos. The majority of the collection consists of birds, but they also keep a handful of mammals and tortoises.
Because it's a very new zoo being repurposed from a pet store, many of the exhibits - especially the indoor exhibits for birds - are small, sometimes even extremely so, but there is continual improvement, and since the zoo opened right before the economic crisis that is Covid-19, they have probably also struggled to fund new exhibits and renovations.
