Dear all, Our new article is now published in PLoS ONE: Bortolotto GA, Thomas L, Hammond P, Zerbini AN (2021) *Alternative method for assessment of southwestern Atlantic humpback whale population status*. PLoS ONE 16(11): e0259541. https://doi.org/10.1371/journal.pone.0259541 Humpback whales wintering off eastern South America were exploited almost to the point of extinction. Today, that population is recovering but the timing is uncertain. In this article, we revise a previous population status assessment and use an alternative method for model fitting (MCMC), which will hopefully be more widely accessible to ecologists. Our approach allowed us to better investigate and reflect scientific uncertainty around historical population levels. Our approach provides an accessible framework for investigating the status of depleted animal populations for which information is available on historical mortality and intermittent estimates of population size and/or trend. The detailed R code for implementing the state-space models in this article are provided in full in the supplementary material. Open access: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0259541#po... Don't hesitate to get in touch with questions, comments and/or suggestions: bortolotto.ga@gmail.com/gabdo@st-andrews.ac.uk All the best, Guilherme A. Bortolotto (he/him) Research Fellow | Sea Mammal Research Unit http://www.smru.st-andrews.ac.uk/person/gabdo/ Project TARSAN International Thwaites Glacier Collaboration https://thwaitesglacier.org/index.php/