Each biological pool is a wetland. Although small, it performs many ecological functions such as natural and much larger wetlands. For example, it is a breeding ground for amphibians such as frogs, toads, newts and salamanders. It is also the birthplace of a series of dragonfly species and counts in a biological pool have revealed that more than 10 species of dragonflies and damselflies can easily breed in a biological pool. Thus, the 2nd of February of each year is also a feast day for the biological pools, because on that day the World Wetlands Day is celebrated.

The origin of World Wetlands Day is related to the creation of the Ramsar Convention (a city in Iran), concerning the conservation and sustainable use of wetlands, on February 2, 1971. According to the Ramsar Convention, it understands – wetlands, areas of marshland, paul, peatland, or water, whether natural or artificial, permanent or temporary, with water that is stagnant or flowing, sweet, brackish or salty, including marine waters whose depth at low tide does six meters. And so, also the biological pools!

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