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Why Koko (Probably) Couldn't Talk (Sorry) | The Deep Dive

3.8M views · May 5, 2021 · 49:12 · 4 HN recommenders · 5 mentions · discussed 2021–2026

A long video essay arguing that Koko the gorilla probably could not actually use sign language. It examines the cherry-picked data and the lack of transparency behind the claims, drawing on published critiques.

Why Hacker News points people here: Recommended as a thorough debunking of Koko's supposed language ability in threads about animal communication.

“While this video is long, it explains the controversy very well”HN comment, 2022

What Hacker News said 5

RecommendsgalkkOct 2021

“recently there was a great video about Koko”

Recent video debunking Koko's language

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The article casually mentions Koko, and it's a bit sad that the story of Koko's "language" is still alive... I can not remember book exceprt, but recently there was a great video about Koko this video

in “Toki Pona: A Language with a Hundred Words (2015)” · view on HN
Recommendsexpensive_newsApr 2022

“While this video is long, it explains the controversy very well”

Explains the Koko sign language controversy

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I’m skeptical of this. This sounds similar to the way Koko “learned” sign language. While this video is long, it explains the controversy very well: this video

in “What happens in your dog’s brain when you speak” · view on HN
RecommendsdlcarrierFeb 2025

“Here's a great video about the extreme cherry picking and lack of transparency”

Critique of Koko claims

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Here's a great video about the extreme cherry picking and lack of transparency it takes to argue that Koko had any better of an understanding of language than a well trained dog: this video

in “Why Teach American Sign Language (ASL) to a Gorilla?” · view on HN
Recommendsgf000Mar 2026

“You may want to watch this video”

Human language differs from animal communication

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You may want to watch this video: this video Human language is way above what communication animals show. We don't really know what's the exact boundary, but again, the difference is significant and not just "scaled up".

in “Epoch confirms GPT5.4 Pro solved a Frontier Math Open Problem for the first time” · view on HN
Cites itSohcahtoa82Apr 2023

“TL;DW - Data was VERY cherry-picked to make it look like she could communicate via sign language.”

Koko data was cherry-picked

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> Note that Koko was obviously a greater communicator than any parrot ever was. Sadly, I don't think this is actually true, despite the popular belief. See this video TL;DW - Data was VERY cherry-picked to make it look like she could communicate via sign language. At best, she was responding via rote memorization and had no idea what she was actually communicating.

in “If Parrots Can Talk, Why Can’t Monkeys?” · view on HN