Simón tells us that "on Sunday 16th at 9:15 hs we saw this falcon above the grassland behind the restroom area of the Viamonte Access. It swooped down in search for a prey, but with no reward."

This peregrine falcon is Falco peregrinus cassini, a subspecies different from the one we frequently see in summer. Cassini is native. The migrant species is Falco peregrinus tundrius. Cassini has a black colouring all over the face whereas tundrius shows white some and a black moustache.