Leif Nilsson at Lund University now sits and collects all hundreds of reports of singing habits from all over the country after the large inventory, he estimates that around 500 singing habits have been reported from Stockholm County this time.

- We have received a lot of reports, I can hardly open my inbox with inventories before I get four new messages, he says.

More access to food

According to him, the number of singing habits has increased mainly due to the large supply of food. For example, gene changes in rape have made it more appetizing for wild birds and more autumn harvesting has provided food for a longer period of time.

- Modern agriculture is the basis. With today's machines, there is also a lot of waste of, for example, small potatoes, root vegetables and sugar beets.