In Portugal, unborn seagulls will be killed using drones.

In Porto, they decided to fight the breeding seagulls with the help of drones. Drones will fly over bird nests and spray their eggs with a mixture of vegetable oil and paraffin. The dried mixture forms a layer that disrupts gas exchange between the inside and outside of the eggs. Because of this, the embryos will not receive the right amount of oxygen, they will not be able to develop and hatch. This method helped to control the population of gulls in Nice. In Porto, it will only be used during the breeding season of birds - from April to June.