Table 1.

Latitudinal variation in the composition of Common Blackbirds’ nests at four study sites throughout Great Britain. Note that miscellaneous materials are defined in the methods. Values are means ± SE.

Study site	Total nest mass (grams)	Mass of twigs (grams)	Mass of dry grasses (grams)	Mass of moss (grams)	Mass of vegetative material (grams)	Mass of mud (grams)	Mass of muddy leaves (grams)	Mass of thin dead stems (grams)	Mass of rootlets (grams)	Mass of miscellaneous (grams)
Aberdeen	213.50 ± 28.60	7.73 ± 3.31	21.54 ± 3.93	8.39 ± 1.96	9.82 ± 0.95	143.43 ± 23.80	13.15 ± 3.20	5.55 ± 1.28	1.49 ± 0.41	0.45 ± 0.17
Lancaster	208.27 ± 25.47	4.95 ± 0.91	17.22 ± 1.79	8.80 ± 2.54	16.47 ± 7.20	133.78 ± 22.30	16.03 ± 4.13	4.83 ± 1.11	3.69 ± 1.59	0.47 ± 0.27
Shrewsbury	184.71 ± 25.32	6.88 ± 1.96	11.05 ± 1.88	4.54 ± 1.35	8.16 ± 0.71	129.69 ± 20.74	13.30 ± 3.25	5.57 ± 0.86	3.29 ± 1.77	0.77 ± 0.28
Penryn	176.84 ± 15.28	3.76 ± 0.99	12.62 ± 2.18	3.42 ± 1.84	8.38 ± 0.70	130.66 ± 14.41	9.35 ± 1.96	3.84 ± 0.84	2.12 ± 0.56	1.27 ± 0.44