It takes surprisingly few generations to evolve traits. If there is a distribution of skittishness and a high pass filter takes away everything under a given li

It takes surprisingly few generations to evolve traits. If there is a distribution of skittishness and a high pass filter takes away everything under a given limit, you'll get rapid evolution. As another example, urban populations of animals have evolved to tolerate noise in the span of very few generations. Giant flightless goose- very tasty!