Read the following article and answer the question.

The next day , I came back with some whole wheat pita bread , and they liked that a lot more than pebbles . On the left of the main entrance to the mill . as seen in the first photo , there is a garden along the sidewalk , and I discovered what I thought was the remains of a mangled bird ... but upon closer inspection I saw it was a nesting female mallard : It remained perfectly still the whole time . It would only blink it 's eyelids every once in a while .

Why did the narrator think that the duck was dead ?
Because it was very still .