I would chose to explain the differences between the raven and the American crow. The raven is usually larger in size with a bigger beak and tail while the American crow is much smaller about the size of a Pidgeon. Another difference is that the raven's tail is "wedge" shaped while the American crow's is "Fan" shaped. The caws are different as well with the ravens sounding more like a croak and the crows being more frequent and "caw" like.
Explanation:
I went to a bird camp where I marked birds and learned to identify them.
