Zoo

Zoo is a seventh level in NextGen versions of Tony Hawk's Pro Skater 4. This is the last unlockable level through career progression, as the last two, Chicago and Carnival, must be bought in order to unlock them. The level's zany animal exhibits provide a wide variety of skateable habitats, anywhere from a Shark tank to a Giraffe pen, etc. The level is often remembered for being quite hazardous, as many animals can make you bail during a long combo. Zoo is also the only level in Pro Skater 4 where large destruction unlocks a hidden area, this being the aquarium, which is opened after an elephant rams into it.

Origin

Zoo level is based on London Zoo. There are UK flags over the aquarium and several buildings found in real life (i.e. Casson Pavillion).

Minigames and Hidden Items

The Zoo level has two unique minigames hidden within it:

If you go into the Giraffe area, and enter the open door, you can then press a button on the wall to trigger a minigame. Monkeys will fling feces at you, and you will have to avoid being hit by it, as well as fling it back in order to win.
Going to the Pigeon coops allows you to play a minigame. You hold a nest in this game, and must traverse left to right in order to catch falling eggs, after doing this many times, you'll eventually win.

There is also a small easter egg within this level:

Near the Hippo exhibit, there are binoculars, looking through them allows you to see two Hippos engaged in sexual activity with one another for only a split second.
Go inside the monkey area (by the Pigeon coops) and stare at a monkey, eventually it will throw feces at the cage.