a wedge of birds Subjectbird (birds)CategoryAnimals → BirdsConfidencehighAttestationwiktionary-attested 2 sourcesWiktionary - wedgeWiktionary - Appendix:English collective nouns
a wedge of geese Context-dependent Subjectgoose (geese)CategoryAnimals → BirdsContextin flightConfidencehighAttestationwikipedia-cited 3 sourcesWikipedia - List of animal namesOxford Dictionaries - What do you call a group of ...?Oxford University Press - AskOxford: G
a wedge of swans Context-dependent Subjectswan (swans)CategoryAnimals → BirdsContextin flightConfidencehighAttestationwikipedia-cited 2 sourcesWikipedia - List of animal namesYourDictionary.com List of Names for Groups of Animals