The only platforms that have up-to-date version are the ones on the mobile (like google play, app store or taptap...). i dont think those websites you playing on are affiliated with yodo1 in any ways, so the version is just ported randomly and likely never got updated ever.
Dont play the poki version. only the mobile versions have all the zones and are up to date
The crocodile is white because it failed to load the skin texture. it's a bug
According to this page, the baby Unicorn boosts the spawn rate of rare animals the most, with 16%
There's no way to get exactly what suit you want, since the unlocked costumes are randomized. You have to keep unlocking costumes until you get banana suit.
I just tried riding the elephant into the savannah, and i got the trojan zebra without riding lions, so it's safe to say that vip animals have their own species. So we can add the vip animals to the wiki and treat them like epic animals.
i think they are just for the teaser, or they are designs that didn't make it to the game. Maybe the devs will add them in the future?