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Why birds do not fall while sleeping

(news.cnrs.fr)
230 points mdp2021 | 3 comments | 15 Oct 24 08:56 UTC | HN request time: 0s | source
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ndheebebe ◴[17 Oct 24 02:17 UTC] No.41865817[source]▶
> The only permanent bipeds of the animal kingdom alongside humans

Kangaroos?

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dhosek ◴[17 Oct 24 02:25 UTC] No.41865856[source]▶
Kangaroos engage in quadrupedal (actually pentapedal—using their tail as well) locomotion at slow speeds.
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defrost ◴[17 Oct 24 02:30 UTC] No.41865877[source]▶
So do humans, babies and the elderly especially.

What has 4 legs in the morning, 2 in the afternoon, and 3 in the evening?

The key here is how relaxed is the interpretation of "permanent".

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rawgabbit ◴[17 Oct 24 03:40 UTC] No.41866215{3}[source]▶
Baby crawling adults walking and old man with cane?
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1. TOGoS ◴[17 Oct 24 04:15 UTC] No.41866372{4}[source]▶
Okay but that's a pretty long day, isn't it? I'm not sure that's a proper 'riddle', per se.
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2. ◴[17 Oct 24 04:41 UTC] No.41866462[source]▶
3. defrost ◴[17 Oct 24 04:54 UTC] No.41866525[source]▶
Like it or not it's been a definitive example of a classic riddle since before it appeared in Oedipus Rex, an Athenian tragedy by Sophocles that was first performed c. 429 BC.

~ https://en.wikipedia.org/wiki/Oedipus_Rex

( spoiler: he loved his mother )