Hills are dark green mounds that block most animals from passing through. For Winter, they are white. The only animals that can climb over hills are the Gorilla, Bear, Polar Bear, Seal, Walrus, Dragon, Crab, Turtle. You can dive under hills when you are in Lakes and Oceans, but any animal who can go over these hills are unable to dive under them and end up resurfacing on them if they go on them whilst diving. When they are in the ocean, they are yellow, while in the arctic they have a more grayish hue.