sixers
The Vikings, that is the VI Kings or 6 Kings (i.e. six roman rulers).
The Arizona Cardinals.
Dallas Cowboys
redskins.
Tennesee titans
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.
The NFL team that is called the opposite of ewes is the Los Angeles Rams. "Ewes" refers to female sheep, and the term "rams" refers to male sheep. Therefore, the name "Rams" represents the opposite gender in the sheep classification.
Bills.
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.
2nd round draft, for The Saints (New Orleans)