Animals that count - Part1

The ability to feel the quantity is not the "specialty" of humans because animals like lemurs and honey can also count.
1. Red back salamander

Psychologist Claudia Uller Essex University (UK) tested the ability to count the red back salamanders in the US by the canister flies. She found that they could distinguish between tubes have 1.2 or 3  flies. But when Uller only offer tube have 3 or 4 flies, they become confused. She then continued to increase the number of flies in the tube up to 16 and found that they continue to distinguish the number from 5 to 16.
2. Chicken

If the chickens were split into several groups, chicks often run into  largest group. Rosa Rugani and Lucia Regolin - two scientists from the University of Padova (Italy) found that chicks can distinguish the number, do simple addition and subtraction.
3. North American coot

Spawning in other groups is fairly common behavior in the North American coot species . Thay do so for the others incubate and nurture their children. To prevent the risk of being cheated, they developed a special ability. They count and remember the number of eggs in the nest after each calving. So they can detect when appears strange eggs.
4. Rhesus Monkey

There is much evidence that some species of primates perceived the number like human. For example, the scientists of Duke University (USA) demonstrated that Rhesus monkeys have capable of identifying group have many objects  among many groups. Their exact extent unchanged after repeated selection.

Part 2

Newscientist