ID: Unique ID for each individual Nestbox: Unique ID for each nestbox StudySite: name of the study site DateCaptFemale: Julian date of capture of the female LayingDate: Julian date of laying of the first egg Treatment: The treatment of the nestbox (control or heated, see the article) IncubDate: Julian date of the start of incubation ClutchSize: Total number of eggs laid FinalClutchSize: Total number of eggs incubated HatchingDate: Julian date of hatching of the first chick in the nestbox Hatchling: Number of hatchlings Fledging: Number of fledglings AgeCapture: Age in years of the female at capture (2 means 2 years old or older) Tarsus: Tarsus length in mm Wing: Wing length in mm BodyMass: Body mass in g Parasites_T: Number of ticks (ectoparasites) Parasites_M: Number of Mallophaga (ectoparasites) Parasites_A: Number of acarid (ectoparasites) Parasites_Mo: Number of hematophagous flies (ectoparasites) Parasites_Pr.LMo.: Number of larvae of hematophagous flies (ectoparasites) Parasites_P: Number of fleas (ectoparasites) ChampsVisuels: Number of visual fields examined to observe 100 leukocytes (see the methods in the article) Erythrocytes: Estimated total number of erythrocytes in all the visual fields examined Haemoproteus: Total number of haemoproteus (endoparasites) in the blood smear Leucocytozoon: Total number of leucocytozoon (endoparasites) in the blood smear Plasmodium: Total number of Plasmodium (endoparasites) in the blood smear AutresP: Other endoparasites in the blood smear Nbtypesparasites: Number of different type of parasites in the blood smear NbMono100: Number of Monocytes in all the visual fields examined NbLympho100: Number of lymphocytes in all the visual fields examined NbHetero100: Number of Heterophils in all the visual fields examined NbHtox100: Number of toxic heterophils in all the visual fields examined NbEosino100: Number of Eosinophils and basophils in all the visual fields examined NbH100tot: Total number of heterophils (toxic + non toxic heterophils) in all the visual fields examined sedim.moy: Blood sedimentation rate ht.moy: Hematocrit lc.moy: Proportion of leukocytes in total blood volume ("buffy coat") ChickAge: Age in days of the chicks at the time of capture of the adult