In this study, we are examining the behaviour, physiology, and contaminant exposure of thick-billed murres (Uria lomvia) breeding in northern Hudson Bay, Canada and overwintering off the coast of Nunatsiavut and Newfoundland/Labrador. In 2019, we collected eggs and blood samples from birds wearing year-round geolocators. Eggs and blood samples were collected from adult thick-billed murres that wore geolocators to track their foraging and migratory behavior year-round. The blood samples were used to determine circulating concentrations of thyroid hormones (free (F)/total (T) triiodothyronine, T3; F/T thyroxine, T4), corticosterone, oxidative stress, and stable isotopes as a proxy for the diet of the birds. Both blood samples and eggs were used to determine total mercury (Hg), methyl mercury (MeHg), per-/polyfluoroalkyl substances (PFAS) and historical brominated flame retardants (BFRs). To date (April 2020), the following laboratory analysis has been completed: blood concentrations of thyroid hormones, Hg and MeHg, along with egg concentrations of Hg and MeHg. Due to the Covid-19 pandemic, analysis of the remaining biomarkers and chemicals has had to be postponed as all laboratories and field work have been shut down until further notice.