In December 2011, the Macedonian Post together with World Wide Fund of Nature (WWF) issued a set of stamps dedicated to rare animals. The stamps depict European ground squirrels.
The European ground squirrel (Spermophilus citellus) is a species from the squirrel family Sciuridae and is besides the speckled ground squirrel (Spermophilus suslicus) the only European representative of the genus Spermophilus. The European ground squirrel grows to a length of approximately 20 cm and a weight of between 200 and 400 g. It is a diurnal animal, living in colonies of individual burrows in pastures or grassy embankments. The squirrels emerge during the day to feed upon seeds, plant shoots and roots or flightless invertebrates. The colonies maintain sentinels who whistle at the sight of a predator, bringing the pack scurrying back to safety.