Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
The number of endangered species that the United States government has no recovery plans for has grown steadily over the past decade, according to an analysis published this month in Conservation Letters1. The plans detail the specific threats against a species as well as the ‘nuts and bolts’ strategies that will help the species recover. They are also mandated under the Endangered Species Act, the country’s key conservation law.