Wildlife Agent or Agent is a rank or position used by several law enforcement agencies within the United States.
In particular, in the Louisiana Department of Wildlife & Fisheries - Enforcement Division, it is a rank below Senior Agent, yet above Cadet. This rank has no rank insignia. Agents who complete 6 months of satisfactory or exceptional service are promoted to the rank of Agent.
Usage in other agencies or countries may vary.
References
Wildlife agent Wikipedia(Text) CC BY-SA