Environmental conditions Migration (IMAGE) Flinders University Caption The infographic shows the routes most likely favoured by the first human migrants across Eurasia and the Americas. These routes are estimated using a statistical combination of archaeological and genetic data. Coloured areas indicate the type of ecosystems encountered, based on climate and vegetation models. The inset image illustrates the ideal migration conditions: warm and humid areas containing a mix of forest and grasslands near rivers. Credit Flinders University Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. Adaptations must be shared under the same terms. License CC BY-NC-SA Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.