Abstract
This study proposes an innovative paradigm for cross-species emotion expression, exploring the potential application of non-human biological features in human emotional communication through the analysis of fish facial morphology. Using a funny fish headshot as the source material, the study analyzes the emotional symbolic meanings assigned to key facial features such as the eyes and mouth of fish in human cognition, discusses and summarizes the diversity of this cross-species mapping, and contributes to enriching the internet ecosystem and making biological knowledge more interesting.