Variation in group territorial behavior: a response to comments on Christensen and Radford

We are grateful for the thoughtful and positive commentaries (Kranstauber and Manser 2018; McGregor and Bee 2018; Ridley and Mirville 2018; Stamps 2018; Thompson and Cant 2018) written about our recent review on the causes and consequences of variation in the responses of group-living species to territorial intrusions (Christensen and Radford 2018). A clear consensus among the commentators and ourselves is the need for more studies in this research field. Here, we emphasize some key future directions, which reflect both general ideas pertaining to variation in territorial responses (relevant not just to groups but also to individual and pair-bonded territory holders) and ideas more specifically relevant to the study of group-living species.