1. A computer-implemented method for identifying automated-agents, comprising: under the control of one or more computer systems configured with executable instructions, receiving a request for a webpage; selecting a security check from a plurality of security checks, the selected security check receiving input; providing, in response to the request for the webpage, the selected security check to cause a challenge presented by the selected security check to be humanly perceivable in a user interface, the challenge being based at least in part on psycholinguistics, evolutionary psychology, color psychology, or a combination thereof; receiving information that includes a response to the challenge of the selected security check; verifying that the response to the selected security check is indicative of a response sent by an automated-agent, the verification being determined at least in part based on the response indicating a correct answer to the selected security questions; and performing one or more actions in accordance with the request being sent by an automated-agent in response to a correct answer to the selected security check.
1. A computer-implemented method for identifying automated-agents, comprising: under the control of one or more computer systems configured with executable instructions, receiving a request for a webpage; selecting a security check from a plurality of security checks, the selected security check receiving input; providing, in response to the request for the webpage, the selected security check to cause a challenge presented by the selected security check to be humanly perceivable in a user interface, the challenge being based at least in part on psycholinguistics, evolutionary psychology, color psychology, or a combination thereof; receiving information that includes a response to the challenge of the selected security check; verifying that the response to the selected security check is indicative of a response sent by an automated-agent, the verification being determined at least in part based on the response indicating a correct answer to the selected security questions; and performing one or more actions in accordance with the request being sent by an automated-agent in response to a correct answer to the selected security check. 5. The computer-implemented method of claim 1 , wherein the one or more operations include denying access to one or more resources, monitoring traffic of one or more requestors, or recording the request.