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The Vikings, that is the VI Kings or 6 Kings (i.e. six roman rulers).
The Arizona Cardinals.
A '500 team' is a team that has won the same number of games as they have lost. The '500' refers to the team's winning percentage.
Bengals Bengal tigers originate from India
There is no NFL team that is named after a fowl. The closest I can think of is a derogatory nickname used for the Seattle Seahawks. They are often called the "Sea-Chickens" by fans of opposing teams.
The Washington Redskins
Nevada has never had a team in the NFL.