highly significantP < 0.001
Separate analyses showed that this occurred because the interaction was highly significant for cavity-nesting species ( t 34 = −3.659, P < 0.001), significant for ground-nesting species ( t 22 = −2.376, P = 0.016) and non-significant for branch nesting species ( t 75 = −0.838, P = 0.253).