Bumblebees Use Sequential Scanning of Countable Items in Visual Patterns to Solve Numerosity Tasks.

Bees trained to four-item patterns (4 + 2−) showed only a weak trend to select three- over one-item patterns in the novel numerosity test ( P = 0.055; Fig. 5B ).

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However, the same is true of the 3 + 1− group, yet these bees chose the higher of the novel numerosities (four rather than two) at a highly significant level.

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