The article from the Chicago Sun-Times discusses the issue of a teenage gorilla named Amare at Lincoln Park Zoo getting too much screen time from visitors’ smartphones.
The Toronto Zoo also experienced a similar problem:
Even gorillas can’t resist the allure of screen time. Perhaps it’s time we all looked up from our phones and rediscovered the world around us—before we need our own buffer zones!
The irony…
Perhaps one day there will be a zoo that tells visitors that they may let the gorillas see only E Ink cellphones?
Love the idea <3:) …or…maybe no phone policy?
But what is the point showing (zoo) animals your smartphone? 
I think @roberto can give you better insights regarding human-animal behavior.
However, I think, as humans, we project a lot of our behavior on animals. We expect them to behave like us & react like us to the same stimuli. Sometimes it works, most of the time it does not.
In this case, humans think since they are so enthralled by screens, other primates might be as well.
That makes sense… 
Human behavior is an interesting topic… 
