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Table 1 Laying dates in April date (1 = 1 April, 31 = 1 May) and number of breeding pairs (in parentheses) of common nest box breeders in all our study plots (1050 nest boxes) in Dwingelderveld, Drents-Friese Wold, and Boswachterij Ruinen [30]. Mean April temperatures are in degrees Centigrade

From: Nest site preference depends on the relative density of conspecifics and heterospecifics in wild birds

Year

F. hypoleuca

P. major

C. caeruleus

April T (°C)

2014

35.5 (271)

12.5 (371)

11.9 (109)

11.4

2016

38.7 (308)

24.0 (410)

19.7 (83)

7.9

2007-2016

36.0 (306)

19.4 (355)

18.2 (99)

9.7