Synopsis
cast 'corvid spies' '<spell>'
Description
Crows are very intelligent birds, and opportunistic feeders. This is less like magic and more like animal training, which cues a nearby crow to fly down and watch out for the telltale motions and sounds of a specific spell being cast.
Corvids are not innately magical, but given their long history as familiars, they have a latent connection to most magical disciplines. When they recognize the named spell being cast, they will alert the room to that fact,as well as attempt to disrupt the spellcast- resulting in its taking 1 additional second to complete.