The Species module provides a powerful interface for cross-species analysis of gene expression. Featuring curated single-cell RNA-seq data from 136 species, it allows users to explore how functional gene sets are expressed across different species and organs. To enable direct comparison, all non-human genes are mapped to their human homologs. Users can choose from 28 gene set categories and visualize expression patterns across evolutionary lineages using interactive filters for species and organ. Homology tables for each species are also available for download within the module. By revealing both conserved and species-specific expression signatures, this module is a valuable tool for evolutionary biology, comparative genomics, and translational research.