Data and code from: Live birth in lizards: A process-based model for the roles of temperature, behavior, and life-history

Life-history traits evolve to optimize fitness trade-offs across an organism’s life cycle. Potentially to mediate the trade-off between survival and fecundity, multiple animal groups have independently evolved live birth (viviparity), including at least 70 transitions in lizards alone. In lizards, viviparity is thought to evolve as a mechanism to improve embryonic development in cold climates (cold climate hypothesis, or CCH), possibly at the expense of the mother’s survival. Past comparative studies often align with the CCH’s predictions, but they usually treat core features of the hypothesis as implicit and, most importantly, infer process from pattern rather than testing causal mechanisms. To address this, we developed a process-based model that integrates behavior, thermal physiology, life history, and climate to predict optimal gestation length in lizards globally. We generated a comprehensive trait database of 89 lizard populations that vary in parity mode, and we used ecophysiolo..., , # Data and code for: Live birth in lizards: A process-based model for the roles of temperature, behavior, and life history

This repository contains all data and code used in the manuscript: \"Live birth in lizards: A process-based model for the roles of temperature, behavior, and life history\" by Garcia-Costoya et al., published in *Evolution Letters* (2025)

## Description of the data and file structure.

All supplementary files are offered within the compressed folder **viviparity-model-supplementary-materials.zip**. Within it, the sub-folder `data/`contains all data used in the manuscript. Within it, there are five files:

1. `adult_data.csv`: Population-level data on adult characteristics. Contains columns for `parity` mode (Oviparity or Viviparity), `species` (in Genus_species format), latitude, longitude (`lat`, `lon` - in degrees), elevation (`elev` - in meters above sea level), adult thermal physiology traits (thermal optimum - `topt_a`, critical thermal minimum - `ctmin_a`, cri...,