If the birds are allowed in, they immediately go into quarantine. “If they are still doing well after ten days, they go to the group,” says Schuyt. In addition, birds are also tested for bird flu. “That actually looks very much like a corona test,” says Van der Heijden. “With one big difference,” adds Schuyt. “The cotton swab also goes into the cloaca. That would also be better for people, then the test is a lot more reliable.”