[aaco]

Other languages also have this exact same quirk, like Spanish[1] or Portuguese[2].

[1] https://es.m.wikipedia.org/wiki/Nombre_colectivo [2] https://pt.m.wikipedia.org/wiki/Substantivo_coletivo

[aspenmayer]

In English, these are called terms of venery:

https://en.wikipedia.org/wiki/Collective_noun#Terms_of_vener...

https://en.wikipedia.org/wiki/List_of_animal_names

[ConsiderCrying]

Wow, that is fascinating. I will have to use auto-translation but definitely saving these for an evening read, thank you.