The Skeleton Giant Lizard is not exclusive to Skull Island; there are quite a few of them in the subterranean areas outside West City. Back in the day, it almost breached the city's walls due to a Beast Tide triggered by the Super Soaring Dragon.
The Swamp Giant Squid, too, is similar; they are found both in the ocean and certain swamps.
But the Solitary Reef Bull Demon is a rarity. Though it looks like a gigantic water buffalo and isn't very aggressive—timid, even—it is undeniably an exclusive species of Skull Island.
Qin Shou crouched down and touched the grass beneath his feet.
Azure Star Power surged into the ground, and Qin Shou raised an eyebrow.
"Such abundant Earth Core Energy!"
Standing up, he looked toward the endless green mountain range and waved his hand to release Rein Jia'er and Kazek.
Determining whether this place was Skull Island was quite simple: find King Kong.