Definitions per each variable contained in the data Database_Provisioning_Repos Year 2018 or 2019 NestboxID NestboxID Species GT= great tit, BT = blue tit BroodID unique brood id Site Study site abbreviation, 7 study sites. UNI= office area, POL=urban park, LOL= urban woodland, PAL= suburban village, OLO and MUR, Res.areas I and II, BIB= urban forest, Date Date of recording as dd/mm/yyyy Jul_date Julian date of recording (1st of April as 1, each year) HatchlingsAge age as day 9 or day 10 (day1= hatching date) CameraSetup time of camera set up: hh:mm:ss FirstApproach time of first approach by individual, as hh:mm:ss FirstToApproach first one in the pair to access the nestbox=1, second one in the pair to access the nestbox=0 FirstApp_touching first approach touching the entrance= yes, flying without touching the entrance=no FirstEntrance time of first entrance as hh:mm:ss FirstToAccess First to access of the pair, 1=yes, 0=no After_time time needed for the second bird to access after the first one, in hh:mm:ss After_time_min time needed for the second bird to access after the first one, in minutes Provisioning provisioning latency given as hh:mm:ss Provisioning_min latency time to access the nestbox in minutes Provisioning_s latency time to access the nestbox in seconds FlewAway Nr of times a bird left the nest before accessing PreyItem does the bird enter the nestbox with a prey item? Y= yes, N=no Sex F= female, M= male Age 2= 1st year breeders, PO2=second or older year breeders Ring Ring number CS Clutch size NrNestlings Total number of nestlings hatched NrFledglings Total number of fledglings per breeding event Fledg_ratio Total number of fledglings weighed by clutch size ISA % of Impervious surface area in a 100m radius around each nestbox HumanP Human presence as nr of humans and dogs detected in a 15m radius Road Distance to the closest road (in meters) Temp averaged daily temperature (in C) refers to the date of recording Rain averaged daily rainfall (mm) refers to the date of recording repeatability Provisioning_min provisioning latency in minutes ID Ring number of great tits that were caught in 2018 and 2019