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In shoals of guppies, larger groups are faster at making decisions when compromise is possible. But when a mutually exclusive decision needs to be made, group size doesn't matter for high predation fish but does for low predation fish.
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This page is a summary of: The effect of group size on the speed of decision making depends on compromise and predation risk across populations in the guppy Poecilia reticulata, Behaviour, October 2020, Brill,
DOI: 10.1163/1568539x-bja10044.
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