Researchers at Brandies University seem to have coaxed a Parrot into
understanding the concept of zero:
Alex, a 28-year-old Grey parrot, recently began — unprompted — using the word “none” to describe an absence of quantity.
Oddly, it seems he may have achieved the feat during a temper tantrum, the scientists say.
It gives a bit of creedance to
this article I posted a long time ago about a parrot with a 950 word vocabulary and, apparently, a sense of humor:
When another parrot hung upside down from its perch, he commented: "You got to put this bird on the camera."