An array of invertebrates is likely to be present on any development site. However, rare and scarce species, or particularly diverse invertebrate communities, are more likely in certain habitats.
Where the extended Phase 1 habitat survey indicates that good habitat for invertebrates is present, or the desk study has provided local records of important invertebrates, the consultant ecologist may recommend further surveys for this group of animals. This is particularly the case if a protected or priority species is likely to be present. In other situations, an invertebrate survey may not be necessary to assess probable impacts of the development because inferences can be made based on the habitats present.
Invertebrates can usually be collected between March and October as they are generally hard to detect at other times of the year. Techniques for collecting invertebrates include using sweep nets, beating trays and pond nets. Invertebrates can also be collected passively, using pitfall traps set in the ground, or light traps, which are useful for catching night-flying insects like moths.