The Montauk Monster
When David and the Professor first enter the wild area at the core, that giant creature with the beak chasing them looks like the Montauk Monster.
https://th.bing.com/th/id/Rfeabd75c6da62b57c38cbbc9034f4116?rik=Y3G9bOQTikR5mg&riu=http%3a%2f%2fcryptomundo.com%2fwp-content%2fuploads%2fmontauk_monster_hires_2a.jpg&ehk=318IWpEARBNOZx0vLvx8Hw1B3vRqIutbjpvaQFhDtPg%3d&risl=&pid=ImgRaw