 The Quenmar package provides a set of tools for detailed development of ecological niche models using MaxENT, enabling rigorous calibration, selection, creation, evaluation, and extrapolation risk analysis. The package takes advantage of the versatility of R and MaxENT to facilitate efficient processes of model calibration, final model creation based on significance, performance, and simplicity, and model transfers to multiple scenarios with assessments of strict extrapolation risks via MOP and MESS metrics. This article was authored by Marlon E. Cobos, A Townsend Peterson, Naraini Barba, and others.