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I saw a video of this on Twitter earlier this week, and it was impressive to say the least! https://twitter.com/horacezhl/status/1503436584212828164 https://tw

I saw a video of this on Twitter earlier this week, and it was impressive to say the least! https://twitter.com/horacezhl/status/1503436584212828164 https://twitter.com/horacezhl/status/1503436584212828164

black_puppydog 5y ago
can we, just here on HN, please acknowledge the difference between a GIF and a full-on video at >= 25fps and with background music? I'm willing to admit defeat on "videos without sound" and "animated PNG"
- willhinsa 5y ago
  You're right, my mistake! I didn't play the video today before I linked it, and I didn't remember it had sound! That was definitely not a GIF! :) I've now updated my original comment to read "video" instead of "GIF" to fix the error.
INTPenis 5y ago
Now I'm a born skeptic but if you put a bunch of ants in a small box won't they eventually try to pick everything up and eventually drop it where the surface is sticky? The video was sped up 100x after all. I fail to see how this was intentional paving of the sticky surface. Also what the motive would have been to pave it since there is no food in the box. They pick this thing up based on pure instinct, or chemical programming, and they get stuck on the sticky surface so they abandon their item. Could be as simple as that until we see more evidence.
- DantesKite 5y ago
  You can try it for yourself. I've tried killing fire ants before with sticky poison and they intentionally "clog" it up, just like in the gif.
- mod 5y ago
  If you scroll down the Twitter thread, there's another gif that highlights an individual worker. Watching her makes it pretty clear that it's intentional, not just dropped or random.
- thaumasiotes 5y ago
  > They pick this thing up based on pure instinct, or chemical programming, and they get stuck on the sticky surface so they abandon their item. Could be as simple as that until we see more evidence. Intentional paving is also based on pure instinct or chemical programming.
- mannykannot 5y ago
  The experiment did include trials with either food or non-food items in the prepared patches, and "significantly more particles were relocated on viscose and paraffin-smeared surfaces in the presence of food than in the presence of non-food objects." The abstract does not say whether, in the absence of particles to relocate, such areas received sufficiently more traversal attempts to account for this difference, and I am disinclined to drop $20 for the full article. One could also wonder why the ants are picking up and moving non-food particles in the first place. The process you describe is one that could have driven selection for picking-up-and-carrying: perhaps it was selected for because it helped foraging in the way you suggest. Is there evidence for or against the proposition that ants are just as likely to pick up and carry these particles whether or not sticky patches are nearby? Do they move them at the same rate in all directions when there is a sticky patch nearby? Under your hypothesis, we might expect the particles to spread equally in all directions, in accordance with some form of the diffusion equation, until they reach the sticky edge, and that's not what seems to be happening in the video.

black_puppydog 5y ago

can we, just here on HN, please acknowledge the difference between a GIF and a full-on video at >= 25fps and with background music? I'm willing to admit defeat on "videos without sound" and "animated PNG"

willhinsa 5y ago
You're right, my mistake! I didn't play the video today before I linked it, and I didn't remember it had sound! That was definitely not a GIF! :) I've now updated my original comment to read "video" instead of "GIF" to fix the error.

INTPenis 5y ago

Now I'm a born skeptic but if you put a bunch of ants in a small box won't they eventually try to pick everything up and eventually drop it where the surface is sticky? The video was sped up 100x after all. I fail to see how this was intentional paving of the sticky surface. Also what the motive would have been to pave it since there is no food in the box. They pick this thing up based on pure instinct, or chemical programming, and they get stuck on the sticky surface so they abandon their item. Could be as simple as that until we see more evidence.

DantesKite 5y ago
You can try it for yourself. I've tried killing fire ants before with sticky poison and they intentionally "clog" it up, just like in the gif.
mod 5y ago
If you scroll down the Twitter thread, there's another gif that highlights an individual worker. Watching her makes it pretty clear that it's intentional, not just dropped or random.
thaumasiotes 5y ago
> They pick this thing up based on pure instinct, or chemical programming, and they get stuck on the sticky surface so they abandon their item. Could be as simple as that until we see more evidence. Intentional paving is also based on pure instinct or chemical programming.
mannykannot 5y ago
The experiment did include trials with either food or non-food items in the prepared patches, and "significantly more particles were relocated on viscose and paraffin-smeared surfaces in the presence of food than in the presence of non-food objects." The abstract does not say whether, in the absence of particles to relocate, such areas received sufficiently more traversal attempts to account for this difference, and I am disinclined to drop $20 for the full article. One could also wonder why the ants are picking up and moving non-food particles in the first place. The process you describe is one that could have driven selection for picking-up-and-carrying: perhaps it was selected for because it helped foraging in the way you suggest. Is there evidence for or against the proposition that ants are just as likely to pick up and carry these particles whether or not sticky patches are nearby? Do they move them at the same rate in all directions when there is a sticky patch nearby? Under your hypothesis, we might expect the particles to spread equally in all directions, in accordance with some form of the diffusion equation, until they reach the sticky edge, and that's not what seems to be happening in the video.