They are discussing the results, but I have trouble understanding the methods and mechanisms. * How did they change a docile group into an aggressive one? If I

They are discussing the results, but I have trouble understanding the methods and mechanisms. * How did they change a docile group into an aggressive one? If I understand this correctly, they took a group of, say, 1000 spiders with a ratio of, say, 10-to-1 docile and removed about 890 spiders to create a new 1-to-10 ratio with 110 spiders. But doesn't such a change in group size also change the group itself significantly? * How was everything tracked after they've been transferred to an environment?