They actually have three.
Bucky is the name of the gigantic white horse on the top of the south stands.
Thunder is the actual horse.
Miles is the person in a costume that resembles the logo.
Although no official stance has been given for the multiple mascots, it can be presumed that Miles is in place so that the fans and particularly children (or intoxicated adults) don't spook the actual mascot, which is indeed a very highly bred horse.
It's likely because the Broncos don't want a bunch of rowdy fans messing with the actual horse (Thunder) and they can't interact with Bucky (the big white horse on top of the stadium - because it's a statue).
Through 2012, the Denver Broncos have an all-time record of 384-313-7. Their postseason record is 17-15.
The Denver Broncos are called the broncos because the origanal AFL team held a contest in 1960 and the Broncos was the winning entry.
The Denver Broncos were 8-8 in 2009.
they got Denver from the city they play in like all NFL teams. the Broncos part was chosen by the owner from when the team became that name.
Curtis Bumgarner Denver Broncos signed as free agent in 1979.
Thunder And Miles
Zac Dysert is number 2 on the Denver Broncos.
The Denver Broncos were founded in 1959.
Denver Broncos was created in 1960.
Through 2012, the Denver Broncos have an all-time record of 384-313-7. Their postseason record is 17-15.
The Broncos play in Denver, Colorado.
The Broncos are 2-4 in The Super Bowl
Peyton Manning is currently with the Denver Broncos.
The Denver Broncos QB currently is Peyton Manning.
The Denver Broncos are called the broncos because the origanal AFL team held a contest in 1960 and the Broncos was the winning entry.
Dog
I love the Denver Broncos but there nickname is the "Donkeys" :)