a labor of moles Book of St Albans A group of moles. ConfidencehighAttestationhistorical-source, wikipedia-cited, wiktionary-attestedAlso spelledlabour (UK) 5 sourcesWikipedia - List of animal namesYourDictionary.com List of Names for Groups of AnimalsWiktionary - laborWiktionary - Appendix:English collective nounsBook of Saint Albans (1486) - The companyes of bestys & foules