An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Daniel TA, Wright AA, Katz JS.Daniel TA, et al. Among authors: katz js.Anim Cogn. 2015 Jul;18(4):831-7. doi: 10.1007/s10071-015-0849-1. Epub 2015 Feb 18.Anim Cogn. 2015.PMID: 25690508