In an article I just read about turkey vultures roosting on a water tower in a local town (their defecation is so acidic it actually corrodes the paint), it says "A group of vultures is called a venue...Vultures circling in the air are a kettle." We've gone through the various group-of-animals words before (i.e a pride of lions), but I've never heard of multiple names for different types of groupings of the same animal.
Anyone know any other examples of this?