Watch Koko the Gorilla Use Sign Language in This 1981 Film | National Geographic
Why the open web links it
Koko the gorilla uses sign language to communicate, offering insight into animal intelligence and human-animal interaction.
Linked by 9 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including mentalfloss.com, 2ch.su, sympa-sympa.com, edu24.cz, farsightprime.com.