It looks like the problem is with the headline writer rather than with the reporter. The reporter correctly described two eagles on separate holes. The headline writer incorrectly combined them into a double eagle. Article headlines are quite commonly provided by someone other than the person who wrote the piece.
In fact, the writer frequently sees the headline for the first time when his article gets published.
Quite right. In Taiwan, I wrote all the headlines for the English-language China Post, but the stories were all written in English by Chinese (yes, I had to copyedit those stories).