#DESCRIPTION OF THE DATA Data supplement 2: Data of body dimensions and feather traits of 52 blackcaps Sylvia atricapilla wintering in the Campo de Gibraltar area, Southern Spain. Title of the paper: Morphological variation as a tool for monitoring bird populations: a review Authors: José Luis Tellería (1), Iván de la Hera (2) and Javier Pérez-Tris (1) Addresses: (1) Department of Zoology and Physical Anthropology. Faculty of Biology.Universidad Complutense de Madrid-CEI Moncloa. 28040 Madrid, Spain. (2) Department of Zoology and Animal Cell Biology. Universidad del País Vasco (UPV/EHU). 01006 Vitoria-Gasteiz, Spain. Email: telleria@bio.ucm.es Description of variables in the spreadsheet: Variable: Description: Age Age of the bird (EURING code). Sex Sex (1=Male, 2=Female). P8 Length of the 8th primary feather (mm). Tail Tail length (mm). WSIP9P1 Wing shape index P9-P1 (P9 and P1 are primary distances 9 and 1, respectively). MIGRES Migratory behaviour of the bird (1=migratory, 2=resident). FMASS Feather mass (mg). The feather is one of the fifth rectrices. LogFMASS Log-transformed feather mass. FGR Feather growth rate (length of ten feather growth bars, mm). LogFGR Log-transformed feather growth rate. FLength Feather length (mm). LogFLeng Log-transformed feather length. The data below is a spreadsheet in CSV text format. Matrix dimensions: 12 colums x 53 rows (including headings): #DATA Age,Sex,P8,Tail,WSIP9P1,MIGRES,FMASS,LogFMASS,FGR,LogFGR,FLength,LogFLeng 6,2,59.5,64.5,10.0,1,6.84,0.8351,33.48,1.5248,65.25,1.8146 6,2,59.0,64.0,12.0,1,7.45,0.8722,36.21,1.5588,68.00,1.8325 6,2,56.0,61.0,11.0,1,7.06,0.8488,34.14,1.5333,63.68,1.8040 6,2,57.5,64.0,8.5,1,7.46,0.8727,31.47,1.4979,67.05,1.8264 6,2,59.0,63.0,14.0,1,7.33,0.8651,33.69,1.5275,66.61,1.8235 6,2,59.0,65.0,12.0,1,7.97,0.9015,32.81,1.5160,67.47,1.8291 6,2,55.5,58.0,13.5,1,5.97,0.7760,30.32,1.4817,59.98,1.7780 6,2,55.0,61.0,9.0,1,6.74,0.8287,32.39,1.5104,62.95,1.7990 6,2,57.0,60.0,11.0,1,6.66,0.8235,31.47,1.4979,62.13,1.7933 6,2,58.5,61.0,9.0,1,6.67,0.8241,31.40,1.4969,62.57,1.7964 6,2,56.0,62.0,9.5,1,6.89,0.8382,33.01,1.5186,64.41,1.8090 6,2,56.5,60.5,4.5,1,6.62,0.8209,31.39,1.4968,63.55,1.8031 6,2,58.5,63.0,10.0,1,7.16,0.8549,31.27,1.4951,65.99,1.8195 6,2,58.5,64.0,10.0,1,7.18,0.8561,33.01,1.5186,65.94,1.8191 6,1,59.0,62.0,13.0,1,7.61,0.8814,31.01,1.4915,64.72,1.8110 6,1,58.0,64.0,13.0,1,7.24,0.8597,33.49,1.5249,65.59,1.8168 6,1,56.5,62.0,8.5,1,7.41,0.8698,31.98,1.5049,64.87,1.8120 6,1,59.0,60.5,13.0,1,6.90,0.8388,31.35,1.4962,64.30,1.8082 6,1,57.5,62.0,8.5,1,6.59,0.8189,30.48,1.4840,63.59,1.8034 6,1,56.0,60.5,9.5,1,6.26,0.7966,28.94,1.4615,60.24,1.7799 6,1,57.0,62.0,11.0,1,6.95,0.8420,32.12,1.5068,63.94,1.8058 6,1,58.5,63.0,11.5,1,7.59,0.8802,33.01,1.5186,63.80,1.8048 6,1,56.0,61.0,9.0,1,6.72,0.8274,31.52,1.4986,64.04,1.8065 6,1,55.0,59.5,8.5,1,6.53,0.8149,30.58,1.4854,61.66,1.7900 6,1,58.5,65.0,13.0,1,7.39,0.8686,32.31,1.5093,65.48,1.8161 6,1,59.0,60.0,11.0,1,6.47,0.8109,31.42,1.4972,65.38,1.8154 6,1,61.0,65.0,11.0,1,8.03,0.9047,33.22,1.5214,67.89,1.8318 6,1,57.0,61.0,11.5,1,6.66,0.8235,28.29,1.4516,60.92,1.7848 6,1,59.0,64.0,9.5,1,7.38,0.8681,31.99,1.5050,66.22,1.8210 6,1,56.5,62.0,11.0,1,7.18,0.8561,29.95,1.4764,65.52,1.8164 6,1,59.0,62.0,15.0,1,6.96,0.8426,32.15,1.5072,64.07,1.8067 6,1,60.0,66.0,12.0,1,7.30,0.8633,34.64,1.5396,68.30,1.8344 6,2,53.0,61.0,7.0,2,6.45,0.8096,28.03,1.4476,62.14,1.7934 6,2,52.0,61.5,4.0,2,6.54,0.8156,26.58,1.4246,60.18,1.7795 6,2,53.0,65.0,3.0,2,6.92,0.8401,28.10,1.4487,63.17,1.8005 6,2,52.5,64.0,3.0,2,6.76,0.8299,28.08,1.4484,63.32,1.8015 6,2,53.0,62.0,4.0,2,7.31,0.8639,28.76,1.4588,64.27,1.8080 6,2,54.5,62.5,4.0,2,7.59,0.8802,31.04,1.4919,65.60,1.8169 6,2,52.0,60.5,5.0,2,6.71,0.8267,30.24,1.4806,62.62,1.7967 6,2,56.0,65.0,7.5,2,7.72,0.8876,33.55,1.5257,66.25,1.8212 6,2,50.0,60.5,2.0,2,6.91,0.8395,29.37,1.4679,63.23,1.8009 6,2,54.5,63.0,6.0,2,6.81,0.8331,27.51,1.4395,63.16,1.8004 6,2,51.5,58.5,4.0,2,5.95,0.7745,29.10,1.4639,59.38,1.7736 6,2,51.5,60.0,4.0,2,6.72,0.8274,28.60,1.4564,63.48,1.8026 6,1,50.0,61.0,3.0,2,6.34,0.8021,25.00,1.3979,59.88,1.7773 6,1,55.0,63.0,5.0,2,7.72,0.8876,29.31,1.4670,66.39,1.8221 6,1,51.0,60.0,6.0,2,7.07,0.8494,29.45,1.4691,63.05,1.7997 6,1,53.0,63.0,2.0,2,7.39,0.8686,28.04,1.4478,64.17,1.8073 6,1,52.0,61.0,5.5,2,6.42,0.8075,27.67,1.4420,60.14,1.7792 6,1,51.0,62.0,4.0,2,6.54,0.8156,28.11,1.4489,62.27,1.7943 6,1,54.0,64.0,4.5,2,7.24,0.8597,30.57,1.4853,64.73,1.8111 6,1,54.5,65.0,4.0,2,7.13,0.8531,31.46,1.4978,65.79,1.8182