Results
Our literature search produced 1450 publications. Based on an initial TRF selection (n = 155), we extracted 36 references with TRF values not corrected for an associated variable such as body mass or age. We added two unpublished TRF data measurements obtained from colleagues (also from blood, see ESM 1 and 2). We ended with 53 species identified with mean adult TRF values (among 38 studies, some reported more than one species (e.g. (Haussmann et al., 2003; Tricola et al., 2018; Whittemore et al., 2019), 29 chick TRF values and 35 TROC values (including 19 species from (Tricola et al., 2018)).