All ravens are crows, but not all crows are ravens.
There are a number of species of crows, and the ravens are than of these groups.
Ravens are larger than most other crows, and have a distinctive croaking call as opposed to many other crow varieties’ cawings.
The raven is found across the northern hemisphere, and can live up to 15 years in the wild.
A group of crows is called a flock or a murder.