How on earth do you have an entire article about a specific type of bird without a single picture of one? They don't charge more for 4 color prints on the internet people...
EDIT: I recognize this article is from NYTimes -- that need not be our gold standard for inspiring awesome communication!
I spent a long time trying to figure out math until I encountered college texts that represented things geometrically, it probably had not occurred to those people who wrote the 20 year old math books I encountered in high school to do such things, but since then someone somewhere figured out how to help people learn better by conveying the information in additional forms.