The french horn usually plays the same part as the violas. it is used for creating background sound in the orchestra.
French horns do have valves, but not the same kind trumpets use. Trumpets use pistons, and french horns use Rotary Valves. However, a marching french horn, a melophone, does have piston valves.
The french word for horn is cor.
yes there are.
French horns are typically played in the key of F.
French Horns are good because they teach you music and play ALL kinds of notes.
yes
In Shakira's song "Dreams for Plans," French horns are used. They contribute to the rich, melodic sound of the orchestration. Tenor horns are not featured in this track.
Yes
addaxs horns
yes cows do use their horns for fighting
French horns, mellophones
See below