Glossary of "Evolution (4th ed.)" by Futuyma & Kirkpatrick (2017)
- In behavioral ecology, interactions between individuals that are either mutualistic or altruistic, so that the actor enhances the fitness of the recipient.
- Futuyma, D. J. & Kirkpatrick, M. 2017. Evolution, 4th ed. -xviii + 602 pp. Sinauer Associates, Inc., Sunderland.