A flock of ravens is called a .........

I wanted to check that what I read was correct that a flock of ravens is called a "coven of ravens". According to http://www.birdnature.com/groupnames.html it is NOT. A group of Ravens is a "congress" or an "unkindness". Other interesting ones are  a "tidings" of magpies, a "parliament" of owls [ I'm sure a flock of owls is probably as rare as a sitting of our own parliament!], and a "host" of sparrows. Since unkindness sounds disparaging, i'll go with a "congress of Ravens"

No drawings yet, just trying to be sure the title is correct.