In Amsterdam, pigs were recently used to fight off birds.
The airport said in a press release that about 20 farm animals were used to chase off geese in the area around the airport.
In September, a pilot project was conducted to see if pigs could help ward off birds. Birds can cause damage if they get sucked into plane engines. They can cause crashes and harm passengers.
The pigs would be able to come and eat the leftovers, which the birds like, removing a source of food.
The pigs grazed on a plot of land between two runways. The bird activity in the area was compared to a plot without pigs.
The main international airport of the Netherlands is called Schiphol.
The pilot project ended in the first week of November.
The data collected will be examined in the coming months, and a decision on the use of pigs will be made early next year.
The airport saw around 150 bird strikes in 2020. Birds can cause serious danger to aircrafts if they are sucked into the engines.
Schiphol is taking structural measures to keep birds away from aircrafts. Bird controllers were set up at the airport to keep an eye on the birds.
The controllers use sounds and lasers to keep the birds away at all hours. Special types of grass that are unattractive for birds are also in place.