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Migration promotes bird diversification. In comparison with sedentary birds (green), migratory birds (red) have low symmetrical and high asymmetrical speciation rates (a), low extinction rates (b) and high net diversification rates (c). Anagenetic transition rates are very low (d). Posterior distributions not different between migratory and sedentary species are shown in grey. Posterior distributions estimates are from MCMC analyses on all birds, using the best-fitting model.
