When a sea turtle hatches, it is impossible to identify their sex because they don’t have any sex-specific external characteristics. They don’t have sex chromosomes, instead their sex is determined by the nest incubation temperature. Recently, our lab has shown that the sex of a hatchling can be determined by the presence of a protein in their blood. Our goal is to improve this assay and develop a large-scale method that will allow us to estimate the sex ratio of a given population.