Many airports around the world are located by the sea, where seagulls and other aquatic birds are regular inhabitants. In these marine habitats, birds are forced to retreat when airplanes approach, rendering untenable the coexistence between animal and machine: although aerial creatures, both natural and artificial, may travel within an open, clear, and apparently limitless space, not even subservient to the same severe limitations to which land is bound, there needs to be a (unilateral) delimitation of the skies. The technical name given to the possible chaos generated by an encounter between an airplane and, for instance, a flock of migrating ducks, is “birdstrike.” In said “strikes,” a group of birds flying at 100 km/h may crash against a plane flying at 900 km/h. If, as a result of such crash, a bird as big as a seagull, pelican or duck happens to accidentally become stuck inside of a turbine, the plane can break down and fall, crashing into land or sea, causing the death of its passengers. [...]