Hidden Animals Guide
On each stage in Sonic Adventure 2, there are animals dotted around the levels - they can even be found hidden behind objects, under items, inside bushes, or stuck in pipes! Each time you find one of these hidden animals you will see a bold white number pop up in the bottom right of your screen indicating how many you have found. When you have found them all, the number will turn RED and you will gain an extra life!
Each level has a random amount of animals in each stage
In Sonic Adventure