It seems to really like the answer 3.3333....

It'll even give answers to a random assortment of symbols such as "+-+-/" which apparently equals 3.89 or.. 3.33 recurring depending on its mood.

"They’re part of a growing list of animals that use namelike calls."

"The fact that we’re not unique in using them is a tantalizing sign that we aren’t the only beings who can recognize ourselves and those around us as individuals."

Pretty much sums up the article. I wish they'd just say this stuff in the title.