Released with publication of
Condit, R., Allen, S.G., Costa, D.P., Codde, S., Goley, P.D., Le Boeuf, B.J., Lowry, M.S., Morris, P. 2020. Estimating the breeding population of an elephant seal colony from a single census. bioRxiv 2020.12.01.368605; https://doi.org/10.1101/2020.12.01.368605.
The same code can be used with an online application at the author's personal website,