More%20than%2020%20big%20illustrations%20depict%20highlights%20from%20an%20exciting%20day%20at%20the%20zoo%2C%20showcasing%20animals%20from%20all%20around%20the%20world.%20Add%20color%20to%20images%20of%20cheetahs%2C%20camels%2C%20hippos%2C%20lizards%2C%20bears%2C%20and%20other%20exotic%20creatures%2C%20portrayed%20in%20re-creations%20of%20their%20natural%20habitats.