Also known as Smuggle Truck, the idea of the game is simple: transport the animals to the destination.
There's a catch: the terrain is horrible, and the animals are NOT tied down. If you hit a hill too hard, some or all the animals will fly out. Yet if you don't use some speed, you won't get past some sections. So, do you got for speed and casualties, slow and max survivors, or something in between?
This has full impact physics, and proper sound effects, so you can do a lot of things, like bounce the passengers out then catch them back.
What's more, there's an editor, and there are supposedly 20000 community-created levels if you got tired of the existing ones.
If you like the genre, this one is worth a try.