Those creatures and more are actually right there in the game on the tougher islands.
The only problem...bummer is those islands are extremely difficult.There is a giant hydra that is massive,scared me just to look at it.Thing is you can climb walls so did that to catch a glimpse of one of the toughest areas of the game...scary,i was likely 200 feet high lol.
So to anyone thinking it was misleading marketing,nah that stuff is all there,i wouldn't lie to you.IS it an ARK clone,well yes and mostly but most Ark players are in agreement Atlas is better.That also was a bit concerning considering all the ARK players basically had a huge head start knowing how the many systems work.
Opinion...If you like survival and building and a scary world,very challenging,this game should make you happy.Biggest drawback is imo the coding is bad,extremely memory intensive,likely need 32 and a strong cpu and gpu.
Personally i have logged in every single day,it is a very intriguing game for me and i am still having fun after 2 weeks.I have not lasted but an hour in 90% of games i have tried the last 10 years.I feel like i can name the games that made me happy on one hand over the last 10 years,most purchases i am bitter and want my money back,with this game i have no regrets at all.
Never forget 3 mile Island and never trust a government official or company spokesman.