Much Ado About 'None'

Researchers explore whether parrot has concept of zero:

"A bird may have hit on a concept that eluded mathematicians for centuries—possibly during a temper tantrum."

"...Alex, a 28-year-old Grey parrot, recently began—unprompted—using the word “none” to describe an absence of quantity, according to researchers at Brandeis University in Waltham, Mass."