Hey, friend! Check out this page for some interesting info! Disney seems to have had a major hand in perpetuating this falsehood. Apparently, per the link,
https://www.snopes.com/fact-check/white-wilderness-lemming-suicide/
"It's a frequent question," he said "'Do they really kill themselves?' No. The answer is unequivocal, no they don't."
The first Black Ops: Cold War has the best overall zombie experience, I would say. Best progression system, mission variety, and level design. Has local split screen or online play for up to 4 players. We played all of the currently released zombies and the BO:CW was the most complete zombies experience IMO.