Figure 1
From: Nest predation risk influences a cavity-nesting passerine during the post-hatching care period
Manipulation of the nest-box entrance as a long-term nest predation risk for oriental tits: (a) control nest box with a 2.6 cm diameter entrance and (b) treatment nest box with a 5.5 cm diameter entrance (after clutch completion) changed from the 2.6 cm (before clutch completion) diameter entrance by switching the front panel for one a larger entrance hole.
