Christian Agrillo and colleagues at the University of Padova (Italy) found that mosquito fish (Gambusia affinis) can distinguish fishes have many individual more. In many specific experiment, the researchers demonstrated that mosquito fish can distinguish the number from 1 to 16.
6. Lemurs
Zoologist Elizabeth Brannon of Duke University (USA) study cognitive behavior of lemurs in decades. In some tests, she proved that ring tail lemurs can arrange the order of increasing or decreasing. Besides, a other species are Mongoose lemur which has likely to know changes the number of object (increase or decrease) in the surroundings.
7. Honeybees
This is the first insect species have the opportunity to prove that they have perceive about number. Dr. Jurgen Tautz, a scientist from the University of Wurzburg (Germany) and colleagues found that honeybees have the ability to distinguish the group consisting of 1,2,3,4 and 5 objects. However, they only distinguish between the two groups. If bees see three or more objects, they will squirm.
Newscientist
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