Final answer:
The most popular state bird in the U.S. is the northern cardinal, claimed by seven states.
Step-by-step explanation:
The most popular state bird in the U.S. is the northern cardinal. It is claimed by seven states: Illinois, Indiana, Kentucky, North Carolina, Ohio, Virginia, and West Virginia. The northern cardinal is known for its bright red color and melodic song, which makes it a favorite among birdwatchers and backyard bird enthusiasts. It is also the state bird of Illinois, Indiana, Kentucky, Ohio, Virginia, and West Virginia.