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Table 1 Effect of sex on morphological measurements in the Oriental Magpie (Pica serica) and the Oriental Tit (Parus minor)

From: Bergmann’s rule and Allen’s rule in two passerine birds in China

Species Traits t p n
Pica serica Body mass − 7.338 < 0.001 161
Wing length − 9.979 < 0.001 165
Bill length − 6.153 < 0.001 152
Tarsus length − 7.037 < 0.001 161
Parus minor Body mass − 1.117 0.264 402
Wing length − 8.147 < 0.001 397
Bill length − 0.269 0.788 371
Tarsus length − 3.218 0.001 373