Look at the tail: Ravens have a distinct wedged-shaped tail, while crows' tails are shorter and more squarish. And listen. I was taken aback when a couple of my friends said that all big black birds ...

From the magpie in the garden at home to the mystical raven in the woods – corvids are fascinating and intelligent animals. But how can you tell whether a bird is a raven or a crow? How does the ...