Figure 1

Body condition index of offspring. Bubble graph of predicted values of body condition index (BCI) of Tengmalm’s owl offspring during 1985–2018 plotted against year (a), log-transformed abundance index of main prey (voles) in the current spring (b), and log-transformed mean amount of precipitation during May to June (c) with regression line (red) and 95% confidence intervals (grey). The bubble size corresponds to the number of predicted (overlapping) cases which was between 1 and 8.