Quite frankly Dave, collective nouns for groups of animals and birds are with a very small number of exceptions have been made up in the past 20 years so they can be asked as questions in pub quizzes. Only yesterday on a kids telly "zoo" programme they told me that a group of "tapirs" is called a "candle". I know you use tapers to light candles, but personally I would go for a "snuffer" of tapers.
Quack!
Geoff the (tails up of) Duck.