When talking about entrepreneurship ecosystems, the biological metaphor ‘ecosystem’ it is utilized to refer to and to define a type of business systems. We do a review of literature of the most cited academic texts that use the term ‘entrepreneurship ecosystem’. Additionally, we do a characterization of this type of system described in the selected bibliographical resources, their characteristics are identified and compared, their similarities and differences are evaluated too. The main conclusion of this study exposes that the utilization of the biological metaphor ‘ecosystem’ to the entrepreneurship ecosystems is not complete. This work was developed as a bachelor’s degree project and it is part of a bigger research to establish the aspects to identify and to create artificial entrepreneurship ecosystems.