Fig. 4
From: The use of nocturnal flights for barrier crossing in a diurnally migrating songbird
The predicted probability of purple martins initiating a water crossing, rather than detouring to circumnavigate over land, does not increase significantly with an increase in tailwind assistance in the optimal direction of travel (left), or during night vs day (right). Probability of crossing decreases significantly as the water to land ratio increases, and the potential savings in distance therefore decrease (center). Shading represents 95% Bayesian credible intervals. Continuous variables were scaled and centered prior to analysis