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Problem solving in small (2 birds) and large (6 birds) groups of house sparrows from different habitats. (A) Total number of wells opened in the group. (B) Latency to open the first well in the group. (C) Latency of the birds to first feeding from the opened wells. A and B show each group as a datum, and C shows data for individuals (petals indicate overlapping data points; means are marked by filled symbols).
