Animation is the process of creating movement and expression for your rigged 3D model. It can be done manually, by keyframing each pose and transition, or automatically, by using motion capture or simulation. Animation can also be layered, combining different types of animation like body, facial, or secondary. When animating an animal, it’s essential to consider the right animation style, such as realistic, cartoon, or fantasy. You should also create a storyboard and animatic to outline the main actions and emotions of the animal. Additionally, you should apply principles of animation like timing, spacing, ease in and out, anticipation, follow through, and overlap to create smooth motion. Reference footage, mirrors, or even acting out the animal's movement yourself can help capture nuances and details. Finally, adding variation and personality to the animal's animation such as blinks, breaths, gestures, and noises will make it more lifelike.