What do you call a group of vultures?
A clutch? A gaggle? A Malkin of vultures?
A venue (or kettle) of vultures
One logically assumes that vultures would have a similarly uncomplimentary term, but they are known as a venue of vultures, or when the birds are circling on thermals, a kettle of vultures because they resemble the rising bubbles of a boiling pot of water. However, the ravens, as the crows’ cousins, share the assignment of a gloomy although less sinister term – an unkindness of ravens.
[From Catalyst Magazine – Animals Animals: A Murder of Crows]