Figure 4.

The relationship of nest size and difference in date of first egg laid by repeat-breeding blue tits (Cyanistes caeruleus) in Wytham Woods, Oxfordshire, UK. Data were collected in April–May 2001–2003. These data are a subset of data from females that bred more than once, to investigate any effect their difference in lay date has on their nest size (n = 223). The R² shows a model of lay-date change was 0.176, although this was not statistically significant (LMM₂₂₃ T = −2.012, p = 0.313); the grey shaded area shows 95% confidence interval.