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Do Small Fish Respond to Numerosity?
Being able to choose the larger shoal as important for small fish also helps them forage, particularly if you knowi what they're looking for are small particles in the water. So many eyes do a better job than just two eyes. The other you ask us, how do you know they're really responding to numerosity, rather than to other features of the environment? E, it's very difficult in er real life, to separate out these two things as they normally go together. And i think the the short answer here is that in real life, the animal will choose whatever is the most efficient way of deciding which is more.