It is characterised by a small amount of water, it forms spontaneously and disappears quickly. A puddle is also the smallest form of reservoir, and from an ecology and zoology point of view, a puddle is a small aquatic biotope. With the help of a microscope, it is also possible to see microscopic life forms (zooplankton) in puddles, which Anthony van Leeuwenhoek was one of the first to discover at the end of the XVIIth century, while examining a drop of water from a puddle. Many inhabitants of stagnant puddles - Daphnia, Bosminus, Diaptomus, Cyclops, mosquito larvae, dragonfly larvae - can be seen with a magnifying glass. For many organisms, such as crustaceans, puddles are attractive because of the coolness, increased humidity and the actual presence of water, while higher ground tends to have more sunlight and is slightly warmer. Amphibians develop in deeper forest pools: frogs, toads and newts, which may also stop near puddles to rest in the coolness.