Conflicts of Interest The authors declare no conflicts of interest. Supporting Information Filename Description jez70032-sup-0001-Supplementary_material_REV.docx375 KB Supplementary figure 1: Location of study site at Playa La Escobilla, Oaxaca, Mexico. The yellow pin shows where nesting females were sampled (modified from Buenrostro-Silva et al., 2024). Supplementary figure 2: Matrices with correlation values for maternal body size parameters in A) 2022 and B) 2023.