The words for birds aren't mine, they're a product of centuries of the human habit of giving fanciful names to preternaturally beautiful and wondrous things - but I'm flattered :-)

A flock of rooks is a clamour, a group of raptors is a convocation (I like that one) or a kettle (?), and owls en masse are referred to as a parliament. A murder of crows and a kindness (or unkindness, depending on who you ask) of ravens are terms used a little more frequently.

Perhaps these for Sherlock's gift from John, for the texting :-)