More nouns of assemblage:

• a business of ferrets
• a cartload of chimpanzees
• a coalition of cheetahs
• a congress of baboons
• a gang of elk
• a huddle of penguins
• a kaleidoscope of butterflies
• a labour of moles
• a prickle of porcupines
• a quarrel of sparrows
• a romp of otters
• a tiding of magpies
• a tower of giraffes
• a ubiquity of sparrows
• a whiteness of swans
• a zeal of zebras

My sources insist that a group of gnus is called an implausibility. Should I believe them?