The Fleet land shore comprises alternating deposits of clays and limestones. Softer exposures of limestone provide a home for a variety of invertebrates. One busy species this month is one of the potter or mason wasps. The individual (probably Ancistrocerus trifasciatus or A. scoticus, both of which have been recorded on the Fleet) in this photograph is a female and she is constructing a nest for a single egg which is fed at the larval stage with paralyzed prey items. The holes show that nests may also be excavated.