At the beginning of March, there are usually still only common spring insects that are active in lowland forests, like in the so-called Nagyerdő forest (part of the Natura 2000) at the northern edge of the city of Debrecen. Most beetles have not yet ended their winter hibernation and this makes them quite easy to find, if one knows where to look for them. The Nagyerdő has many different tree species - it is partly a park, so there are many alien trees as well. The most important tree species for the insects are the old Pendunculate Oaks that grow here in a large number. These trees support a suprising diversity of insects. Many wasps, ants, bugs and beetles require oaks: either they feed from the oaks, or they prey on the plant-eaters. Also, decaying oak wood is the sole food source for many endangered beetles. And in winter, many arthropods hybernate under the barks of old oaks. The majority of these is still inactive in March, and one can find many rare species under the pieces of bark. Some other trees like pines and sycamores host an entirely different collection of arthropods under their barks. Location: Nagyerdő, Debrecen. Date: 03.2011.