Commentary on Thoral et al. (2024) ‘The relationship between mitochondrial respiration, resting metabolic rate and blood cell count in great tits’ - Kasja Malkoc; Michaela Hau; Scott McWilliams; Edyta Teresa Sadowska; Maciej Dzialo; Barbara Pierce; Lisa Trost; Ulf Bauchinger; Eve Udino; Stefania Casagrande (Biology Open)