Why do people say "tuna fish," but not say "chicken bird" or "beef mammal"?

LovesDemBabes
Why not?
BECAUSE THEY FUCKING CAN
I couldn't care less...
How the hell do you come up with these questions?
Humans... pathetic worthless humans...
I'm emerald77 and I'm a genius and can do whatever the hell I want
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How did 5 people vote F... emerald77 is the one and only... and really... which GUY voted F...
Why do people say "tuna fish," but not say "chicken bird" or "beef mammal"?
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