Pierre-Axel Monternier, Vincent Marmillot, Jean-Louis Rouanet, Damien Roussel; Mitochondrial phenotypic flexibility enhances energy savings during winter fast in king penguin chicks. J Exp Biol 1 August 2014; 217 (15): 2691–2697. doi: https://doi.org/10.1242/jeb.104505