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- Botha-Brink, J. & S.P. Modesto (2007), "A mixed-age classed ‘pelycosaur’ aggregation from South Africa: earliest evidence of parental care in amniotes?", Proceedings of the Royal Society B: Biological Sciences 274 (1627): 2829–2834, DOI:10.1098/rspb.2007.0803
- Social behaviour is often said not to leave fossil traces as a matter of principle. This paper reports on (still unusual) circumstances under which inferences about social aspects of the life of now extinct species might have merit.