What does 'bired' mean ?
a penguin is a bird.
No, a penguin is a bird.
It is a bird
No, a penguin is not a mammal.
A penguin
You tell me
Penguins are birds.
no, its a bird
No. They are birds.
Man is the only mammal that cannot fly but does. He uses aeroplanes. (And the penguin is not a mammal: it is a bird and some say it 'flies' underwater.)
No, a penguin is not a mammal. A penguin is a bird. However, it is one of the few birds (like the ostrich) that does not fly.