This Week in Science Endangered species surrogates + See all authors and affiliations Science 13 Sep 1996:Vol. 273, Issue 5281, pp. 1469DOI: 10.1126/science.273.5281.1469f Article Info & Metrics eLetters Log in to view full text Via AAAS ID This article is available to AAAS members. If you are a AAAS Member use your via AAAS ID and password to log in. Not a member? Click here to join. Join/Subscribe Purchase Article Activate Member Account Renew Subscription Recommend a subscription to your library Help for librarians Order a single issue Free with registration Science research is available free with registration one year after initial publication. To get your free access please visit our registration form.