Variable;"Western Bonelli’s Warbler";"Eastern Bonelli’s Warbler" "wing chord length (mm)";"63.6 (63.4−63.8) range: 56−73, N = 1072";"66.0 (65.9−66.2) range: 49−77, N = 1666" "body mass (g)";"7.2 (7.2−7.3) range: 4.8−10.5, N = 1025";"7.0 (6.9−7.0) range: 4.6−11.0, N = 1646" "body condition index";"0.114 (0.113−0.115) range: 0.075−0.161, N = 1025";"0.106 (0.105−0.106) range: 0.073−0.167, N = 1644"