Raw data belonging to: Crestani, A. C., M. A. Pizo, A. B. A. Fontanella, L. G. Herrera M., A. P. Cruz-Neto. Sugar and nitrogen digestive processing does not explain the specialized relationship between euphonias and low quality fruits. Journal of Avian Biology. DOI: 10.1111/jav.02873. "Metadata for file ""compensatory feeding""" bird_species bird species used in experiments bird_individual individual bird (numbered sequentially) for each species used in experiment concentration (g sugar/100 ml water) concentration of sugar expeirmental sugar solution delta Mb difference between initial and final body mass of individual birds Initial Mb body mass of individual birds at the start of the experiment final Mb final body mass of individual birds after 12 h feeding exclusively on the experimental sugar solution mean Mb (g) mean value between initial and final body masses Vol intake (ml/d) volume of sugar solution taken by each bird taken per day ( = 12-h experimental period) energy intake (kj/d) energy intake (calculated based on the volume intake and the caloric content of the different types of sugars and casein used to prepare the different solutions) per day ( = 12-h experimental period) vol intake/Mb volume intake per mean body mass energy intake/Mb energy intake per mean body mass "Metadata for file ""N-requirement""" bird_species bird species used in experiments bird_individual individual bird (denoted by different letters) for each species used in experiment MNR 12 h (mg N) maintenance N requirements calculated for 12 h "Body mass (mean of measurements on day 2; g)" mean body mass of individual birds at the2nd day of the experiment