An analysis of passerine egg traits across the city mosaic: Urbanisation does not affect egg size and pigmentation patterns

EGG_DATABASE_CLEAN_R_2025 - data on egg traits, environment and life history This file includes data on: breeding year (“YEAR”), nestbox ID (“NESTBOX_ID”), egg ID (“EGG_ID”), egg ID with side specification (EGG_ID_SIDE), breeding event ID (“unique_breeding_event”), latitude (“Lat”), longitude (“Long”), Impervious Surfaces Area percentage in 100 m radius from the nestbox (“ISA”), environment category based on median ISA value for broods (“ENV”), egg volume (“Voulme”), egg surface area (“Surface Area”), % of analysed region compared to the whole egg side (“oval_percente_area”), pixel overexposure (“R_pixel_overexposed”), spots red chroma (“spots_Rchroma”), percentage of spots covering analysed area (“percentSpots”), average spot size (“avgSpotSize”), visually scored spots intensity (“GS_Intensity”), visually scored spots distribution (“GS_Distribution”), visually scored spots size (“GS_Spot_size”), lay date (“LayDate”), clutch size (“CS”), female ring ID (“F_Ring_ID”), female tarsus length (“F_Tarsus”), female weight (“F_Weight”), female body condition (“F_SMI”) EGG_WHOLE_OVAL_CLEAN_R_2025 - repeatability tests, data on egg traits for whole eggs and for sub-areas This file includes data on: egg ID (“EGG_ID”), region category (“WHOLE_VS_SUBAREA”), pixel overexposure (“R_pixel_overexposed”), percentage overexposure (“R_percent_overexposed”), overexposure category (“R_pixel_overexposed”), percentage of spots covering analysed area (“percentSpots”), spots red chroma (“spots_Rchroma”), average spot size (“avgSpotSize”) GS_rep_IS_CLEAN_2025 - repeatability tests, data from two scoring sessions This file includes data on: breeding year (“YEAR”), nestbox ID (“NESTBOX_ID”), breeding event (“Breeding_event”), scoring session type (ORGINAL_VS_REPETITION”), egg ID (“EGG_ID”), visually scored spots intensity (“Intensity”), visually scored spots distribution (“Distribution”), visually scored spots size (“Spot_size”) SIDES_rep_CLEAN_2025 - repeatability tests, data for two sides of eggs This file includes data on: egg ID with side specification (EGG_ID_SIDE), egg ID (“EGG_ID”), pixel overexposure (“R_pixel_overexposed”), percentage overexposure (“R_percent_overexposed”), overexposure category (“R_pixel_overexposed”), percentage of spots covering analysed area (“percent_spots”), spots red chroma (“spots_Rchroma”), average spot size (“avgSpotSize”), egg voulme (“Volume”) TRAILS_REP_CLEAN_2025 - repeatability tests, data on same clutches photographed twice This file includes data on: egg ID with side specification (“EGG_ID”), pixel overexposure (“R_pixel_overexposed”), percentage overexposure (“R_percent_overexposed”), overexposure category (“R_is_overexposed”), spots red chroma (“spots_Rchroma”), average spot size (“avgSpotSize”), percentage of spots covering analysed area (“percent_spots”), , egg voulme (“Volume”) PAPER_EGGS_2025 - code for the paper with step by step descriptions