This repository provides the complete data and code to reproduce the analyses for the Biology Letters submission on mammalian pace-standardized lifespan (PSL, n=28 taxa). - Zenodo_submission_package_PSL_n28_WITH_100trees.zip: Core statistical modeling package. Includes raw data, R scripts (OLS/PGLS), and 100 posterior mammalian trees for sensitivity analysis. - Zenodo_submission_bundle_PSL_n28_v2.zip: Figure generation package. Includes Python scripts (make_fig1-3.py), figure-specific Excel workbooks, and documentation for reproducibility.