Here are the possible solutions for they're usually only known for their voices clue
Answer
Clue
Relevancy
djs
Clue
They're usually only known for their voices
dormice
Clue
They got their name from their hibernation
Definition
DORMOUSE, any member of a family of rodents related to mice
stentors
Clue
Their voices really carry
ayes
Clue
They're usually first to raise their hands
Definition
AYE, an affirmative vote, also AY
anonymousdonors
Clue
They don't want to be known for their gifts
toucans
Clue
They're known for their beaks
awls
Clue
If they're boring, they're doing their job
Definition
AWL, a pointed tool for making holes
sahl
Clue
Early and influential stand-up comedian Mort who said, "Liberals feel unworthy of their possessions. Conservatives feel they deserve everything they've stolen" haha I feel that