Protocol to request
            
                Assessing the evolutionary history of adult song plasticity
                
                
            
        
        
            
                Research article
            
            
                Correlated evolution between repertoire size and song plasticity predicts that sexual selection on song promotes open-ended learning
                
            
            
            
                Cristina M Robinson et al.
            
            
                DOI: 10.7554/eLife.44454