Data S4: Tables with data collected for meta-analyses Table Meta-S1. Effect sizes for comparisons of genetic similarity to focal females between extra-pair and cuckolded males Species Acrocephalus arundinaceus Acrocephalus arundinaceus Acrocephalus arundinaceus Acrocephalus schoenobaenus Acrocephalus sechellensis Acrocephalus sechellensis Carpodacus mexicanus Cygnus atratus Dendroica caerulescens Emberiza schoeniclus Emberiza schoeniclus Emberiza schoeniclus Geospiza fortis Geospiza scandens Geothlypis trichas Geothlypis trichas Geothlypis trichas Geothlypis trichas Geothlypis trichas Geothlypis trichas Geothlypis trichas Hirundo rustica Luscinia svecica Malurus splendens Melospiza melodia Melospiza melodia Oenanthe oenanthe Pachycephala pectoralis Parus ater Parus caeruleus Parus caeruleus Parus caeruleus Passer domesticus Passer domesticus Passerculus sandwichensis Tachycineta bicolor Tachycineta leucorrhoa Troglodytes aedon Trait Relatedness Band sharing Band sharing Band sharing Genetic similarity (rQG) Band sharing Genetic similarity (rQG) Relatedness Compatibility Genetic similarity (rQG) Genetic similarity (rQG) Relatedness Genetic distance (Nei’s D) Genetic distance (Nei’s D) Genetic distance (amino acid) Allele sharing Genetic distance (amino acid) Genetic distance (amino acid) Allele sharing Genetic distance (amino acid) Genetic similarity (rQG) Genetic similarity (rQG) Genetic similarity (rQG) Genetic similarity (rQG) Relatedness Relatedness Genetic similarity (rQG) Relatedness Band sharing Band sharing Relatedness Relatedness Genetic similarity (rLR) Genetic similarity (rQG) Relatedness Genetic similarity (rQG) Relatedness Genetic similarity (rQG) Genetic marker Microsatellite RFLP DNA fingerprinting DNA fingerprinting Microsatellite MHC Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite MHC (MHC 1 PBRs) MHC (MHC 1) MHC (MHC 1) MHC (MHC 2 PBRs) MHC 2 MHC (MHC 2) Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite DNA fingerprinting DNA fingerprinting Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Microsatellite Statistical test Paired t Sign test NA, but provide mean and sd. of measurements Sign test Paired t Paired t Paired t Paired t Logistic regression Paired t Paired t Wilcoxon signed-rank test Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Mean difference and 95%CIs Wilcoxon matched pairs test Paired t Paired t Paired t Paired t Paired t GLMM GLMM Paired sign test Paired t Paired t Paired t Npair 18 5 7 9 52 29 7 29 25 20 47 83 50 9 19 19 19 18 18 18 19 90 75 107 84 18 8 12 63 18 96 61 461 461 47 66 34 20 Fisher’s Zr -0.150* -0.290* 0.400 0 -0.069 0.069 0.468* -0.094 -0.146 0.062* -0.109 0.123* 0.037 0.074 -0.105 -0.079 -0.114 0 -0.123 0 -0.201 -0.135 0.127* -0.080* -0.091 -0.288* -0.077* -0.348 -0.056* 0.059 0.044 -0.031 0.002 -0.023 -0.193* 0.211* -0.470* 0.189 Reference Hansson et al. 2004 Bensch et al. 1994 Hasselquist et al. 1995 Langefors et al. 1998 Richardson et al. 2004 Richardson et al. 2005 Oh & Badyaev 2006 Kraaijeveld et al. 2004 Smith et al. 2005 Kleven & Lifjeld 2005 Bouwman et al. 2006 Suter et al. 2007 Grant & Grant 2011 Grant & Grant 2011 Bollmer et al. 2012 Bollmer et al. 2012 Bollmer et al. 2012 Bollmer et al. 2012 Bollmer et al. 2012 Bollmer et al. 2012 Bollmer et al. 2012 Kleven et al. 2005 Fossøy et al. 2008 Tarvin et al. 2005 O'Connor 2003 Hill et al. 2011 Kudernatsch et al. 2010 van Dongen & Mulder 2009 Schmoll et al. 2005 Kempenaers et al. 1996 Foerster et al. 2003 Charmantier et al. 2004 Current study Current study Freeman-Gallant et al. 2006 Whittingham & Dunn 2010 Ferretti et al. 2011 Masters et al. 2003 * indicates that the Fisher’s Zr is based on the assumption that correlation = 0.2014 between extra-pair and cuckolded male measurements Table Meta-S2. Effect sizes for comparisons of body size between extra-pair and cuckolded males Species Acrocephalus arundinaceus Acrocephalus schoenobaenus Acrocephalus schoenobaenus Agelaius phoeniceus Dendroica caerulescens Trait Tarsus length Weight Wing length Body size Tarsus length Trait type Tarsus Weight Wing Body size Tarsus Statistical test Paired t Wilcoxon signed-ranks test Wilcoxon signed-ranks test Paired t Paired t Dendroica caerulescens Dendroica caerulescens Dendroica petechia Emberiza citrinella Emberiza schoeniclus Emberiza schoeniclus Emberiza schoeniclus Euplectes orix Euplectes orix Euplectes orix Ficedula albicollis Ficedula hypoleuca Geospiza fortis Geospiza fortis Geospiza fortis Geospiza scandens Geothlypis trichas Malurus splendens Malurus splendens Malurus splendens Nectarinia osea Oenanthe oenanthe Parus caeruleus Parus caeruleus Parus caeruleus Parus caeruleus Parus caeruleus Parus caeruleus Parus caeruleus Parus major Parus major Parus major Weight Wing length Body size Tarsus length Tarsus length Weight (residual) Wing length Tarsus length Weight Wing length Body size (PC1) Tarsus length Beak shape (PC2) Beak size (PC1) Body size (PC1) Weight Weight Tarsus length Weight Wing length Wing length Body size (standardized) Tarsus length Tarsus length Tarsus length Tarsus length Weight Wing length Wing length (standardized) Tarsus length Weight Tarsus length Weight Wing Body size Tarsus Tarsus Weight Wing Tarsus Weight Wing Body size Tarsus Beak Beak Body size Weight Weight Tarsus Weight Wing Wing Body size Tarsus Tarsus Tarsus Tarsus Weight Wing Wing Tarsus Weight Tarsus Paired t Paired t Wilcoxon matched pair test Paired t Paired t Paired t Paired t Wilcoxon test Wilcoxon test Wilcoxon test Paired t Paired t Paired t Paired t Paired t Sign test Paired t Paired t Paired t Paired t Paired t Wilcoxon matched pairs test Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Npair 10 9 9 78 25 18 23 20 11 48 48 48 19 19 19 10 10 66 66 66 9 28 99 99 99 4 8 31 73 35 61 61 61 32 12 14 15 Fisher’s Zr 0.019 -0.411* -0.380* 0.061* -0.183 -0.078 -0.060 0.143* 0.133 -0.012* 0.048* 0.225 0.264 0 0.260 -0.098* -0.189* 0.058* 0.066* -0.082 0* 0.073* 0.095* 0.066* 0.017* -1.301* 0.493* -0.179 0.231 0.367 0.015* 0.019* 0.037* 0.073 -0.011 -0.312 0 Reference Hasselquist et al. 1996 Marshall et al. 2007 Marshall et al. 2007 Westneat 2006 Webster et al. 2001 Webster et al. 2001 Webster et al. 2001 Yezerinac & Weatherhead 1997 Sundberg & Dixon 1996 Bouwman et al. 2007 Bouwman et al. 2007 Bouwman et al. 2007 Friedl & Klump 2002 Friedl & Klump 2002 Friedl & Klump 2002 Sheldon & Ellegren 1999 Lehtonen et al. 2009 Grant & Grant 2011 Grant & Grant 2011 Grant & Grant 2011 Petren et al. 1999 Garvin et al. 2006 Tarvin et al. 2005 Tarvin et al. 2005 Tarvin et al. 2005 Zilberman et al. 1999 Kudernatsch et al. 2010 Foerster et al. 2003 Foerster et al. 2003 Kempenaers et al. 1997 Charmantier et al. 2004 Charmantier et al. 2004 Charmantier et al. 2004 Kempenaers et al. 1997 Van Oers et al. 2008 Van Oers et al. 2008 Strohbach et al. 1998 (continue) Species Parus major Passer domesticus Passer domesticus Passer domesticus Passer domesticus Passer domesticus Phylloscopus fuscatus Phylloscopus fuscatus Phylloscopus fuscatus Setophaga ruticilla Sialia currucoides Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Taeniopygia guttata Tyrannus tyrannus Tyrannus tyrannus Tyrannus tyrannus Vermivora chrysoptera Vermivora chrysoptera Vermivora chrysoptera Vermivora chrysoptera Vermivora chrysoptera Vermivora chrysoptera Wilsonia citrina Wilsonia citrina Wilsonia citrina Trait Wing length Beak length Tail length Tarsus length Weight Wing length Body size (PC) Weight (lean) Wing length Wing length Wing length Tarsus length Weight Wing length Weight (corrected) Wing length Wing length Tarsus length Weight Wing length Body size (PC1) Beak length Tarsus length Wing length Beak depth Beak length Beak width Tarsus length (right) Wing length (left) Wing length (right) Tarsus length Weight Wing length Trait type Wing Beak Body size Tarsus Weight Wing Body size Weight Wing Wing Wing Tarsus Weight Wing Weight Wing Wing Tarsus Weight Wing Body size Beak Tarsus Wing Beak Beak Beak Tarsus Wing Wing Tarsus Weight Wing Statistical test Paired t GLMM GLMM GLMM GLMM GLMM Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Repeated measures ANOVA Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Npair 15 414 414 414 414 414 14 14 14 21 25 9 7 12 14 14 4 9 9 11 28 40 40 40 14 14 14 14 16 16 22 22 22 Fisher’s Zr 0.214 0.003 0.027 0.034 0.050 0.009 -0.518 -0.246 -0.013 -0.083* 0.291* -0.120 0.049 0.362 -0.243* -0.013* 0.762* 0.143 0.501 -0.017 0.353 -0.014 0.214 0.060 -0.058 -0.242 0.141 -0.222 0.015 0.054 0 0 0.130 Reference Strohbach et al. 1998 Current study Current study Current study Current study Current study Forstmeier 2002 Forstmeier 2002 Forstmeier 2002 Reudink et al. 2009 Balenger et al. 2009 Kempenaers et al. 1999 Kempenaers et al. 1999 Kempenaers et al. 1999 Bitton et al. 2007 Bitton et al. 2007 Lifjeld et al. 1993 Kempenaers et al. 2001 Kempenaers et al. 2001 Kempenaers et al. 2001 Tschirren et al. 2012 Dolan et al. 2007 Dolan et al. 2007 Dolan et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Stutchbury et al. 1997 Stutchbury et al. 1997 Stutchbury et al. 1997 * indicates that the Fisher’s Zr is based on the assumption that correlation = 0.0482 between extra-pair and cuckolded male measurements Table Meta-S3. Effect sizes for comparisons of secondary sexual traits between extra-pair and cuckolded males Species Acrocephalus arundinaceus Acrocephalus schoenobaenus Agelaius phoeniceus Agelaius phoeniceus Carpodacus erythrinus Carpodacus erythrinus Carpodacus erythrinus Carpodacus erythrinus Cyanistes caeruleus Cyanistes caeruleus Cyanistes caeruleus Cyanistes caeruleus Dendroica caerulescens Dendroica petechia Emberiza citrinella Emberiza schoeniclus Emberiza schoeniclus Emberiza schoeniclus Emberiza schoeniclus Ficedula albicollis Ficedula albicollis Ficedula albicollis Ficedula hypoleuca Ficedula hypoleuca Ficedula hypoleuca Geothlypis trichas Geothlypis trichas Geothlypis trichas Geothlypis trichas Geothlypis trichas Hirundo rustica Malurus splendens Malurus splendens Melospiza melodia Parus caeruleus Parus caeruleus Parus major Passer domesticus Passer domesticus Phylloscopus fuscatus Trait Song repertoire size Repertoire size Epaulet size Extent of nonblack Brightness Composite coloration (PC1 from hue, brightness and saturation) Hue Saturation Hue Hue (cuckolder was a juvenile) UV chroma UV chroma (cuckolder was a juvenile) Wing spot size Plumage streaking Colour Badge colour Badge size Repertoire size Syllable number Forehead patch area Forehead patch width White wing patch Drost score Forehead patch size UV Black facial mask Premating song rate Bib colour (PC1) Bib size Mask size Tail streamer Percentage of blue on abdomen Tail length Song repertoire size Average pause length Average strophe length Breast stripe width Badge size Mask area Repertoire size Trait type Song Song Ornament Ornament Ornament Ornament Statistical test Paired t Wilcoxon signed-ranks test Paired t Paired t Paired t Paired t Npair 10 10 75 72 19 19 Fisher’s Zr 0.558 -0.401* 0.004* 0.015 0.090* 0.262* Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Song Song Ornament Ornament Ornament Ornament Ornament Ornament Ornament Song Ornament Ornament Ornament Ornament Ornament Tail Song Song Song Ornament Ornament Ornament Song Paired t Paired t Paired t Paired t Paired t Paired t Paired t Wilcoxon matched pair test Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Wilcoxon matched pair test Paired t Paired t Provide the mean difference and its 95%CIs Paired t Paired t Paired t GLMM GLMM Paired t 19 19 48 15 48 15 18 26 11 21 48 14 14 12 12 12 11 10 8 16 13 29 29 30 43 99 99 13 6 6 14 231 229 7 0.212* 0.186* -0.054* 0.155* -0.081* 0.140* 0.060 0.084* 0.498 0.102* 0.076* 0.017* 0.045* 0.024* 0.515* 0.006* -0.272* -0.012* 0.206* 1.810* 0.211* 0.031* 0.149* 0.227 0.223 0.008* 0.045* -0.074 0.667 0.881 -0.191 0.031 -0.016 -0.073* Reference Hasselquist et al. 1996 Marshall et al. 2007 Westneat 2006 Westneat 2006 Albrecht et al. 2009 Albrecht et al. 2009 Albrecht et al. 2009 Albrecht et al. 2009 Delhey et al. 2007 Delhey et al. 2007 Delhey et al. 2007 Delhey et al. 2007 Webster et al. 2001 Yezerinac & Weatherhead 1997 Sundberg & Dixon 1996 Bouwman et al. 2007 Bouwman et al. 2007 Bouwman et al. 2007 Bouwman et al. 2007 Sheldon & Ellegren 1999 Sheldon & Ellegren 1999 Sheldon & Ellegren 1999 Lehtonen et al. 2009 Lehtonen et al. 2009 Lehtonen et al. 2009 Thusius et al. 2001 Thusius et al. 2001 Garvin et al. 2006 Garvin et al. 2006 Garvin et al. 2006 Kleven et al. 2006a Tarvin et al. 2005 Tarvin et al. 2005 Hill et al. 2011 Kempenaers et al. 1997 Kempenaers et al. 1997 Strohbach et al. 1998 Current study Current study Forstmeier et al. 2002 (continue) Species Phylloscopus fuscatus Phylloscopus fuscatus Phylloscopus fuscatus Phylloscopus trochilus Setophaga ruticilla Setophaga ruticilla Setophaga ruticilla Setophaga ruticilla Setophaga ruticilla Setophaga ruticilla Sialia currucoides Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Tachycineta bicolor Taeniopygia guttata Taeniopygia guttata Taeniopygia guttata Taeniopygia guttata Taeniopygia guttata Taeniopygia guttata Taeniopygia guttata Taeniopygia guttata Taeniopygia guttata Tyrannus tyrannus Tyrannus tyrannus Tyrannus tyrannus Tyrannus tyrannus Tyrannus tyrannus Vermivora chrysoptera Vermivora chrysoptera Vermivora chrysoptera Vermivora chrysoptera Wilsonia citrina Wilsonia citrina Wilsonia citrina Wilsonia citrina Wilsonia citrina Wilsonia citrina Wilsonia citrina Trait Residual syllable rate Song with higher residual performance Tail length Song length Bib size Bib size Flank brightness Flank redness (PC1) Tail brightness Tail redness (PC1) Colour scores Tail length Plumage hue (PC1) Plumage blue chroma (PC2) Plumage brightness (PC3) Bill colour (PC1) Bill colour (PC2) Bill colour (PC3) Breast band size Cheek colour (PC1) Cheek colour (PC2) Cheek colour (PC3) Cheek patch size Song rate 30 min song rate 5 min song peak rate Actual song rate Tail length Start time Cap area Cap length Cap width Tail length Breast brightness Breast colour Cheek brightness Cheek colour Hood size Song rate Amount of time spent on singing Trait type Song Song Tail Song Ornament Ornament Ornament Ornament Ornament Ornament Ornament Tail Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Ornament Song Song Song Song Tail Timing of singing ornament Ornament Ornament Tail Ornament Ornament Ornament Ornament Ornament Song Timing of singing Statistical test Paired t Paired t Paired t Wilcoxon's signed rank test Binomial test Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Mixed model ANCOVA Mixed model ANCOVA Mixed model ANCOVA Mixed model ANCOVA Mixed model ANCOVA Mixed model ANCOVA Mixed model ANCOVA Mixed model ANCOVA Mixed model ANCOVA Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Paired t Npair 7 7 14 5 7 21 17 18 19 19 29 8 14 14 14 28 28 28 27 28 28 28 28 26 21 21 21 40 21 10 10 10 14 19 19 14 14 19 17 17 Fisher’s Zr 0.073* 0.704* 0.215 0.553 -0.145* 0.106* 0.215* 0.306* -0.085* 0.246* -0.020* 0.090 0.019 0.015* 0.183* 0.188 -0.301 0 -0.203 -0.357 -0.231 0.610 0.029 0.617 0.301 0.264 0.266 0.189 0.327 -0.081 -0.051 -0.374 -0.185 0.009 0.012 0.087 -0.040 -0.016 0.284* 0.046* Reference Forstmeier et al. 2002 Forstmeier et al. 2002 Forstmeier 2002 Gil et al. 2007 Perreault et al. 1997 Reudink et al. 2009 Reudink et al. 2009 Reudink et al. 2009 Reudink et al. 2009 Reudink et al. 2009 Balenger et al. 2009 Kempenaers et al. 1999 Bitton et al. 2007 Bitton et al. 2007 Bitton et al. 2007 Tschirren et al. 2012 Tschirren et al. 2012 Tschirren et al. 2012 Tschirren et al. 2012 Tschirren et al. 2012 Tschirren et al. 2012 Tschirren et al. 2012 Tschirren et al. 2012 Tschirren et al. 2012 Dolan et al. 2007 Dolan et al. 2007 Dolan et al. 2007 Dolan et al. 2007 Dolan et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Vallender et al. 2007 Chiver et al. 2008 Chiver et al. 2008 Chiver et al. 2008 Chiver et al. 2008 Chiver et al. 2008 Chiver et al. 2008 Chiver et al. 2008 * indicates that the Fisher’s Zr is based on the assumption that correlation = 0.5367 between extra-pair and cuckolded male measurements Table Meta-S4. Effect sizes of comparisons of age between extra-pair and cuckolded males. Species Acrocephalus arundinaceus Agelaius phoeniceus Cyanistes caeruleus Dendroica petechia Emberiza citrinella Emberiza schoeniclus Emberiza schoeniclus Ficedula albicollis Geospiza fortis Geospiza scandens Luscinia svecica Malurus splendens Melospiza melodia Parus caeruleus Parus caeruleus Parus caeruleus Parus major Parus major Passer domesticus Passer domesticus Passer domesticus Periparus ater Periparus ater Phylloscopus fuscatus Phylloscopus trochilus Poecile atricapillus Progne subis Wilsonia citrina Trait type Known age Known age Age class Known age Known age Age class Age class Unknown Known age Unknown Age class Age class Known age Known age Known age Known age Age class Age class Known age Age class Known age Known age Known age Age class Known age Age class Known age Known age Statistical test Paired t Wilcoxon test Wilcoxon paired test Chi-square Paired t Provided mean and s.e. Sign test Wilcoxon signed-ranks test Sign test Sign test Fisher’s exact test Wilcoxon matched-pairs signed-rank NA, but provide the mean difference and 95%CIs Wilcoxon's matched pairs signed ranks Wilcoxon's matched pairs signed ranks Paired t Wilcoxon signed-ranks Chi-square GLMM Sign test Paired t Wilcoxon's signed-rank Wilcoxon's signed-rank Wilcoxon’s signed-rank Wilcoxon’s signed-rank Sign test Wilcoxon test Paired t Npair 10 57 49 26 11 17 10 12 97 9 59 108 19 36 79 61 11 15 461 10 23 18 21 14 5 15 74 22 Fisher’s Zr 0.490 0.284* 0.313* 0.418 0.253 0.420 0.348* 0.081* 0.216* -0.337* 0.179* -0.135* -0.291* -0.083 0.223 0.027* -0.247* 0.080 0.015 0 0.556 0.276 0.341 0 0.182 0.274* 0.180* 0.053 Reference Hasselquist et al. 1996 Weatherhead & Boag 1995 Delhey et al. 2007 Yezerinac & Weatherhead 1997 Sundberg & Dixon 1996 Bouwman et al. 2007 Kleven et al. 2006b Sheldon & Ellegren 1999 Grant & Grant 2011 Petren et al. 1999 Johnsen et al. 2001 Tarvin et al. 2005 Hill et al. 2011 Foerster et al. 2003 Foerster et al. 2003 Charmantier et al. 2004 Strohbach et al. 1998 Van Oers et al. 2008 Current study Stewart et al. 2006 Wetton et al. 1995 Schmoll et al. 2007 Schmoll et al. 2007 Forstmeier 2002 Gil et al. 2007 Otter et al. 1998 Tarof et al. 2012 Stutchbury et al. 1997 * indicates that the Fisher’s Zr is based on the assumption that correlation = 0.1394 between extra-pair and cuckolded male measurements Table Meta-S5. Articles with pairwise comparisons between extra-pair and cuckolded males that were excluded in our meta-analyses Reference The reason to be excluded Genetic similarity with focal females Promerova et al. 2011 Insufficient information to identify the direction of the effect Stewart et al. 2006 Insufficient information to identify the direction of the effect Body size Delhey et al. 2003 Dunn et al. 1994 Johnsen et al. 2001 Kappes et al. 2009 Kraaijeveld et al. 2004 Leisler et al. 2000 Zilberman et al. 1999 Insufficient information to identify the direction of the effect or the effect size; sample size too small (Npair =2) Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Secondary sexual traits Delhey et al. 2003 Dunn et al. 1994 Johnsen et al. 2001 Kappes et al. 2009 Kraaijeveld et al. 2004 Leisler et al. 2000 Zilberman et al. 1999 Data used in Delhey et al. 2007, which is included in the meta-analysis already Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Insufficient information to identify the direction of the effect or the effect size Sample size too small (Npair = 2) Insufficient information to identify the direction of the effect or the effect size Age Delhey et al. 2003 Grant & Grant 2011 Kempenaers et al. 1997 Leisler et al. 2000 Vallender et al. 2007 Webster et al. 2001 Data used in Delhey et al. 2007, which is included in the meta-analysis already Insufficient information to estimate the effect size Insufficient information to estimate the effect size Insufficient information to estimate the effect size Insufficient information to identify the direction of the effect Insufficient information to identify the direction of the effect or the effect size References Albrecht T, Vinkler M, Schnitzer J, et al. 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