[vacri]

Who is surprised? No-one in the article nor the sub-editor's choice of headline suggests surprise.

Where are the sensationalist lines that you see? Apart from the heading, the article is full of questions as to whether or not the birds are doing a modern variation of a previously acknowledged behaviour, from the first paragraph to the second-last. It seems to me that you're reading too much into just the heading, then choosing to be outraged.