Watch out! High vigilance at small waterholes when alone in open trees.

Single Gouldian finches had a higher frequency of head movements than most other group sizes with significant differences to group sizes of two and 5–7 birds and approaching significance for group sizes of 3–4 birds (bootstrapping: 1 vs 2 birds: p = 0.010, 1 vs 3–4 birds: p = 0.062, 1 vs 5–7 birds: p = 0.019, 1 vs > 7 birds: p = 0.169; Fig 3 ).

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The interaction between head colour morph and sex approached significance ( Table 2 ) with black-headed males showing a lower frequency of head movements than juveniles (bootstrapping: p = 0.030; Fig 4 ).

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