I was in one of the hippo viewing platforms overlooking the Mara river in the Masai Mara National Reserve when this female hippo saw us. Her yawn was a threat display, telling us not to come any closer. Not that we had any intention of doing so!
Nikon D700, Sigma 150-500mm OS at 450mm, F6.3, 1/320s, ISO 200, handheld.
Masai Mara National Reserve, Kenya