Pteronemobius heydenii - Marsh-cricket
Description: A small cricket (♂ 5-6 mm, ♀ 5-7 mm), colour is dark brown and black. Head without light markings. There are 4 spines on the outer side of the hind tibiae. The wings extend at least halfway up the abdomen. The ovipositor is short (2 mm) in relation to the bodylength.
Similar species: Nemobius sylvestris
Adults: from May to August
Song: Pleasant, high-pitched chirp, lasting 1 to 4 seconds and increasing in volume. There is a 1-2 second pause between two chirps. It sings both in daytime and at night.