They ported it, but changed it to be easier and nicer. That's a bit of a shame.
It's even more fun if you're playing co-operatively. Unlike the arcade game, Jambo! Safari for Wii has a multiplayer mode. (Although the arcade game did, in fact, have an unofficial multiplayer mode - one of you drove the jeep and captured the animals while the other one shouted "No he's gone left, I said LEFT, go on, get him, ****ING COME ON, KILL IT KILL IT AAAAAAAAA" etc.)