[1] The species is common and widespread in the Western Palearctic, and the IUCN lists it as Least Concern.

[2] Wing patterns vary between individuals and can be mottled, striped, striped-mottled, or plain.

[6] C. brunneus prefer habitats with sward heights of 100 to 200 mm and fine leaved grass species.

[7] Vertebrate grazing is thought to alter plant hormones two of which are known to effect fecundity, abscisic acid, and gibberellins.

[7] Additionally grazing results in the production of proteinase inhibitors in plants and the alteration of nitrogen levels.

[8] Although a female response to male song does not guarantee mating it does increase the likelihood of copulation.

[10] A positive correlation also exists between the number of eggs per pod and the length of a female's hind femur.

[11] Using in situ hybridization an extra rDNA sequence is consistently found on the X chromosome in C. brunneus that is absent in C.

[11] C. brunneus and C. jacobsi can also be differentiated based on song and by the difference in number of stridulatory pegs located on the hind femur.

[11] Using a mark and recapture procedure, the lifetime dispersal of C. brunneus and C. jacobsi were estimated to be similar to other grasshopper species that form hybrid zones.

[14] Differences in song traits echeme, syllable, and phrase length have a small epistatic effect but cannot be fully explained by genetic factors.

[15] Peg numbers on the stridulatory file, while different between the two species, are surprisingly not dependent on song characteristics.

[15] Instead additive effects explain the phenotypic variation in both song characteristics and peg number between C. brunneus, C. jacobsi, and their hybrids.

[15] When C. brunneus was exposed to X-irradiation during the zygotene-early pachytene stages of meiosis, this treatment caused a significant increase in meiotic cell chiasma frequency.

[18] In the lab, C. brunneus prefer dry and compact substrates composed of fine particles such as sand.

[4] Eggs laid in the last part of the breeding season are smaller in size due to deteriorating maternal health.

[19][20] While eggs can withstand a large amount of water loss they cannot survive complete desiccation.

[4] Eggs laid by C. brunneus from late August to early September are the heaviest, hatch the latest, and have heavier hatchlings.

Increased population density also results in decreased adult size as well as slower development.

[23] Additional instars have been found in other acridid species that display sexual dimorphism in which females are larger than males such as C.

[23] Females with the additional instar have only been found to occur in the region of East Anglia in Britain.

[23] The longer summers in East Anglia may facilitate earlier hatching and an increased growth rate permitting the inclusion of instar IIa allowing the females to reach a larger size.

[23] Decreased availability of food may encourage rapid development also explaining the inclusion of an additional instar.

[10] C. brunneus reared with a radiant heat source take six to seven weeks less to reach their adult instar than those that are not.

[25] Male C. brunneus not only produce several different types of calls, they also show variation in characteristics of the same song.

[26] They are commonly found living in habitats that are polluted with heavy metals such as Szopienice and Olkusz in Poland.

[27] Because C. brunneus in non polluted reference sites do not experience the same decrease in enzyme activities, researchers have suggested that the decreased enzyme activities can be contributed to the tradeoff associated with adapting to living in heavily polluted habitats.