But can a bird that is still behaviorally very much like its ancestor, the jungle fowl, really express natural behavior in a cage?
This is because cats naturally use a specific spot, whereas that is not a dog's natural behavior.
"These systems are not reinventing human behavior, but allowing natural behavior to occur".
With the songbird, researchers have a way of following a rich natural behavior.
The steps required to advance the plot, though often devilishly perplexing, felt like natural behavior rather than arbitrary puzzle-solving.
"We'd rather they have as natural behavior as possible," said Bengt Holst, director of conservation for the Copenhagen Zoo.
"People inevitably point at the screen, thinking something would happen -- it's such a natural behavior," he said.
"The beauty of this is how it helps capture what infants are thinking about during natural behavior.
There is just an awful lot, considering that only yesterday the population was ridiculing etiquette and declaring itself satisfied with unrestrained natural behavior, thank you very much.
"They think they've got neighbors, and you're clearly going to maintain natural behavior in captivity, all for the price of a postage stamp".
"Because of these anthropogenic emissions," Crutzen wrote, the global climate is likely to "depart significantly from natural behavior for many millennia to come".
