A Stare of Owls

Found a wonderful children's book yesterday by Brian Wildsmith called "Birds". As well as wonderful illustrations it lists the group names for various types of birds. Some of them are great and typify the characteristics of the birds described. For example, what better name could there be for a gathering of owls but a "stare".
Some of the others are ;
A party of jays,
a walk of snipe,
a company of parrots and my favourite - an unkindness of ravens. Great eh?