The obsession with hygiene in the West often goes overboard. Many theories and some evidence also suggest that the cleanliness we 'enjoy' here in the West has lead to a greater amount of allergy, astma and diminished immune development/priming which has consequences later in life. Some might even argue that a few delightful birds flying around is good for the health in the long run.

Much of the obsession with hygiene, especially in bureaucratic countries such as the Netherlands, has as much to do with actual health as with bureaucrats who feel the need to enforce rules because that is, after all, the rule. Never mind that many rules don't often make much sense.

Just the same, I would argue a few mice running around Schiphol is hardly a cause for concern. As long as they don't end up in aircraft holds and keep out of the food, it's really much ado about nothing.