In animal behaviour, group augmentation occurs when animals living in a group behave so as to increase the group's size. Such behaviour could be selected for if larger groups increase the survival chances of the individuals in the group; therefore individuals could be selected to help raise other animals' offspring (alloparental care) or perform other cooperative acts, even helping unrelated individuals.
- Kokko, H.; Johnstone, R. A.; Clutton-Brock, T. H. (2001). "The evolution of cooperative breeding through group augmentation". Proceedings of the Royal Society B: Biological Sciences. 268 (1463): 187–96. doi:10.1098/rspb.2000.1349. PMC . PMID 11209890.
- Clutton-Brock, T. (2002). "Breeding Together: Kin Selection and Mutualism in Cooperative Vertebrates". Science. 296 (5565): 69–72. doi:10.1126/science.296.5565.69. PMID 11935014.