I’m replying to a post that’s over nine years old, but I hasten to bring up the following:On ZT2 the polar bear is under Low Risk but they are a vulnerable species. They included koalas in the Endangered Species Pack even though are not. The Zoopedia also says that the Bengal tiger is the largest cat species in the world.
I believe polars were listed as a LR species back in 2004 when the base game was released, with them being uplisted to VU in 2006 IIRC.
Also, the Bengal tiger may not be the largest tiger subspecies/former subspecies, but being a tiger it still technically belongs to the largest cat species.