Have a look at http://http://www.dancingbots.com which visualizes Orderbook positions. Most of the action (95%?) close to current price looks like positions from bots.
Compare the orderbooks of exchanges which have no fees for maker orders (like gdax, bitfinex) and are preferred by bots to those exchanges who do ask for a fee.
HEY! this site is amazing and is just what I am looking for. BUT the link you provided is missing a colon after "http" and I thought the site was down for a second. I am sure if others see this they will have similar issues. Please fix your link :)
Compare the orderbooks of exchanges which have no fees for maker orders (like gdax, bitfinex) and are preferred by bots to those exchanges who do ask for a fee.