Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Contagious yawning in African elephants at the Knysna Elephant Park in southern South Africa. The adult female, Keisha in the foreground, who had just stood up, starts yawning 2 s after the sub-adult male, Mashudu, in the background, begins yawning. Mashudu had just previously stood up from a recumbency. See Table 3, Set 1 for details. The video clip with this image is available in Supplementary Material (with permission of the Knysna Elephant Park).
