https://www.youtube.com/watch?v=AfUkI-n4jpo&t=23s
I'd guess most corporate fleet ThinkPad end users never saw the bird flapping its wings to fly as you moved it around the screen with your Trackpoint, but kudos to IBM (known for wearing suits at the time) for letting this bit of whimsy slip through to customers.
Maybe it was indicative of corporate flexibility that helped the ThinkPad introduce so many innovations and general technical excellence, and made it such a respected and beloved brand.