The Gambusia Holbrook, fish of about 5 cm from North American eaters of mosquito larvae and imported into Europe in the first 900 just to fight malaria, and in the lagoon of Venice, would be able, in their own way to 'count'.
the data emerging from the research, coordinated by prof. Angelo Bisazza, University 'di Padova, and carried out by Christian Agrillo, PhD, Department of General Psychology. The ability 'accounts would be limited, however, to focus more clearly between the two groups' numerous and fall into what are called spontaneous choices common to many other animal species. These fish, to find shelter from predators, tend to form large groups.
Through laboratory experiments and is 'seen as putting a fish on one side of a bath and putting on the other groups of different numbers of fish, fish' lonely 'group recognizes the more' numerous and tend to congregate in this.'' This happens when the fish has to choose between groups of two or three, or three or four. But when 'in front of the fish, are groups of five or six fish, the' solitaire 'can not find the group more' large. Therefore it is said that their capacity 'to' count 'up to four. E 'can do that, however, if the numerical difference between the two groups and 'very strong, as in the case has to be selected from a group of eight and one of 16 fish. The research, according to researchers, lead to the conclusion that the fish use a sort of 'battery' internal audit to identify the group most 'numbers, that estimate the amount' of the area that the group has''
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