a clutter of cats Subjectcat (cats)CategoryAnimals → MammalsConfidencehighAttestationwikipedia-cited, wiktionary-attested 4 sourcesWikipedia - List of animal namesOxford University Press - AskOxford: CWiktionary - clutterWiktionary - Appendix:English collective nouns
a clutter of spiders Subjectspider (spiders)CategoryAnimals → Insects & arachnidsConfidencehighAttestationwikipedia-cited 2 sourcesWikipedia - List of animal namesOxford University Press - AskOxford: S