Some websites have been overwhelmed by the sheer volume of bot traffic. Credit: Marco VDM/GettyIn February, the online image repository DiscoverLife, which contains nearly three million photographs of different species, started to receive millions of hits to its website every day — a much higher volume than normal. At times, this spike in traffic was so high that it slowed the site down to the point that it became unusable. The culprit? Bots.These automated programs, which attempt to ‘scrape’ la...