What are the main designs of animal motifs?

Western Han Dynasty tiles, in addition to text, there are animal motifs form, or patterns and text and design. Animal motifs are also the main form of the "Four Gods" theme, such as the "White Tiger" and "Vermilion Bird" two tiles, the image is taken from the reality, and delineate their different demeanor and character, the two tiles are the same. The two tiles are the same, that is, in the round surface range, so that its shape as far as possible to stretch, in order to constitute a typical "suitable for the pattern" form, without losing the natural demeanor of the characteristics of the birds and beasts.