The collective noun "labour" is used to refer to a group of moles. So, a "labour of moles" is a term used to describe a group of these small, burrowing mammals. Other collective nouns for moles include "a company of moles" and "a movement of moles".
Indeed, the world of collective nouns provides unique and often poetic terms to describe groups of animals. Here are a few more collective nouns associated with specific animals:
1. **Crows:**   - A murder of crows (already mentioned, but noteworthy)   - A parliament of crows
2. **Owls:**   - A parliament of owls (also used for crows)   - A stare of owls
3. **Lions:**   - A pride of lions (already mentioned, but noteworthy)   - A coalition of lions
4. **Hedgehogs:**   - An array of hedgehogs   - A prickle of hedgehogs
5. **Penguins:**   - A colony of penguins   - A rookery of penguins
6. **Ducks:**   - A flock of ducks   - A brace of ducks
7. **Geese:**   - A gaggle of geese   - A skein of geese (in flight)
8. **Bats:**   - A colony of bats   - A cloud of bats
9. **Whales:**   - A pod of whales   - A gam of whales
10. **Fish:**    - A school of fish (already mentioned, but noteworthy)    - A shoal of fish
Collective nouns not only add flair to language but also offer insights into the historical and cultural connections between humans and animals. These imaginative terms contribute to the colorful tapestry of the English language.