Gordon M. Burghardt. The Genesis of Animal Play: Testing the Limits. Cambridge, MA: The MIT Press, 2005.
308
Tropheus duboisi – цихлида из озера Танганьика. – Прим. перев.
309
G. M. Burghardt, Vladimir Dinets, and James B. Murphy. Highly Repetitive Object Play in a Cichlid Fish (Tropheus duboisi) // Ethology 121, no. 1 (2014). P. 38–44.