At my school in Lincolnshire there has been a huge corvid over the last few months. It is massive and hangs around after break and occasionally attacks the windows! I looked up the differences between ravens and crows and became convinced it was a crow as it said ravens have wedge shaped while crows have fan shaped tails. However, after seeing them on springwatch they look pretty fan shaped to me! I highly doubt it was a raven, but could it have been?!