Grauer's gorilla group Chimanuka gathered around the corpse of an extra-group silverback

Grauer's gorilla group Chimanuka discovered the corpse of an extra-group silverback and they gathered around and stared at it

Mountain gorilla juvenile male Segasira with his mother Tuck's corpse.mp4

Segasira sits on and grooms his mother's corpse

Mountain gorilla blackback Urwibutso displays with his mother Tuck's corpse

Urwibutso displays with his mother Tuck's corpse by kicking it in the abdomen. He displays a second time and drags vegetation while moving toward her and then lays down next to her corpse

Grauer's gorilla silverback Chimanuka displays with the corpse of an extra-group silverback

Chimanuka displays with the corpse of an extra-group silverback by hitting it on the back with his fists

Mountain gorilla silverback Umushikirano displays with adult female Tuck's corpse

Silverback Umushikirano displays with Tuck's corpse by hitting it in the abdomen with his fist and then he stands in a strut-stance posture. Two blackbacks, Pato and Turakora, embraced and mounted a few meters away immediately following the display. All of the group members continued to rest close by

Mountain gorilla juvenile male Segasira with his mother Tuck's corpse

Segasira grooming his mother's corpse

Grauer's gorilla blackback named BB1 grooming the corpse of an extra-group silverback

BB1 groomed the corpse for extended periods of time, with one bout lasting five consecutive minutes

Grauer's gorilla affiliative and agonistic behaviors toward the corpse of an extra-group silverback

Grauer's gorillas sniffing, poking, licking, and grooming the corpse of an extra-group silverback they discovered in the forest. The silverback Chimanuka displays with the corpse and it rolls several meters down a slope

Changes in encounter rate at 10 sites across Grauer’s gorilla range.

<p>Changes in encounter rate at 10 sites across Grauer’s gorilla range.</p

The mean (centre) and 95% confidence interval (left: lower bound; right upper bound) of the gorilla distribution range using the same boundaries as Fig 2.

<p>The mean (centre) and 95% confidence interval (left: lower bound; right upper bound) of the gorilla distribution range using the same boundaries as <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0162697#pone.0162697.g002" target="_blank">Fig 2</a>.</p