Something like that. I think the study wasn't designed/interpreted well to demonstrate variable behavior.
They presented the pigeons with 5 differently colored buttons. 5 button presses of any color in any order would dispense a food reward.
The pigeons continued to press random buttons and get their food. The researchers argued that since the pigeons didn't press the same sequence every time, or the same button 5 times in a row, that this demonstrates they prefer to try new behaviors rather than stick with ones they know result in a reward.
I think they might be giving the pigeons too much credit, intelligence-wise... but I'm kind of a pigeon hater so I'm severely biased lol