How do you tell the difference between Common Gulls and Herring Gulls?

People sometimes struggle to tell the difference between the common gull and the herring gull because the plumage is very similar and from a distance it can be difficult to tell just how large they really are (unless they’re very close to one another), but it’s a lot easier if you look at this table:

  Common Gull Herring Gull
Length 430 mm – 17 inches 635 mm – 25 inches
Beak Plain yellow Plain yellow, but with red spot underneath
Legs Pale greenish yellow Pink
Eyes Red Pale with ring of yellow skin