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Table 1.

Summary of breaking data for the feather barbs

VariableMeans.d.s.e.m.N
Force (Fbrk) (N) 1.15 0.56 0.042 176 
Extension (lbrk) (mm) 0.61 0.23 0.017 176 
Stress (σbrk) (MN m−2281 76 6.1 156 
Strain (ϵbrk0.060 0.024 0.0018 176 
Toughness (T) (MJ m−310.1 6.7 0.54 156 
VariableMeans.d.s.e.m.N
Force (Fbrk) (N) 1.15 0.56 0.042 176 
Extension (lbrk) (mm) 0.61 0.23 0.017 176 
Stress (σbrk) (MN m−2281 76 6.1 156 
Strain (ϵbrk0.060 0.024 0.0018 176 
Toughness (T) (MJ m−310.1 6.7 0.54 156 

Data for unmelanized and melanized barbs are pooled since no colour-based differences were detected (see figures and text).

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