Dragonfly's extreme loop-the-loops | Hacker News Reader

Dragonfly's extreme loop-the-loops

science.org

131 pointspseudolus44 comments

If we wanted to make a drone have the intelligence of a dragonfly (which might still be a decade away), we would at least need a billion parameters and a trillion tokens in training data. Just helps us appreciate what nature is capable of.

Sounds about right, 1 million neurons and potentially 1 billion synapses. Back in school I used to think computers and machines were so advanced and complex compared to boring old biology. It was such a silly misconception to be so many orders of magnitude off in complexity.

Tokens? Is that the new « bit »?

Is nature doing that? Or following a much simpler pattern?

Does the how matter if we can’t replicate it the same way?

Producing complex behavior simply is usually harder and more elegant than using a lot of superfluous complexity.

I feel pretty confident saying it is not following a simpler pattern. It is doing something very hard, with far less training data and a much more alien form of compute (which is also much slower in general than computers).

Is there some elegant learning algorithm in nature that enables this? Maybe. But I don’t think there’s any simplification of the task, that nature has found. For example, I doubt we will find a 100 line algorithm to do the motion the dragonfly did, or a simple physics equation to describe it etc. My intuition, stems from the bitter lesson, a lot of these tasks are irreducibly complex and trying to find elegant simple models, tends to be a waste of time.

I guess we're still not out of the 'flying into a window' stage. https://en.wikipedia.org/wiki/Loitering_munition

Not mentioned is the frame rate for data acquisition which can approach 300 frames per second equivalent so they kind of live through time a bit differently than we do. (Credit to An Immense World by Ed Yong)

That’s exactly the impressive part, the speed of doing these moves. The moves themselves on a lower speed is very common to see in fancy pigeons, though much slower

Although bugs can still have a 'what the F was that?' reaction, per the classic 'catapulting tiny pies at flying insects' video. https://m.youtube.com/watch?v=Y6nshKhqyqU (Millimetres Matter)

I watched this cool video recently on dragonfly movement. Dragonflies Hunt by Predicting the Future https://www.youtube.com/watch?v=8i9WMD6xbuA

In the summer, one of my "hobby" is just to sit in my backyard and watch a couple of dragonflies circles around, swoop down and catch flies/mosquitoes. They have a way to fly close, rendezvous with the targets and then just swoop down in all of a sudden to kill them. Fascinating animal! I could sit there and watch them in constant state of awe.

same, have a natural pond in my backyard and I can watch them all day

Dragonflies are freakin' awesome. By far my favorite insect.

Not only are they incredible acrobats but they can eat up to a hundred mosquitos (my least favorite insect) per day with a hunting success rate of 95%.

That's awesome. Any way to facilitate them to multiply in my garden? There are enough mosquitos to go around.

The Internet is your friend. See eg https://www.reddit.com/r/dragonfly/comments/10z03h6/how_to_a...

To summarize the reddit thread, apparently no, you can't practically attract dragonflies to your garden

“Nonsense . We have a pond barrell with pond plants in and occasional fountain and we have attacted the dragonflies the size of your hand. Dragonflies love pomd plants becsuse it's where they lay their eggs. Line an old whiskey barrell, fill I'm holes with filler, add rocks, plants and water and they will find it ”

“I have lady palms and there are tons of dragonflies that live in them. When I walk by I have 10-15 fly out at any time, babies and adults. I don’t have a water feature but live in Florida where it’s always pretty humid this time of year.”

“ I'm in the Austin area, and have had great success with a very small water feature made from a 90 quart (about 18 gallons) Sterlite storage bin. I dug a hole deep enough to bury it flush to the ground, filled it with large rocks and water. I bought a plant with a tall stalk. Within 2 weeks a great big red dragonfly had claimed the spot as his. I've have them back every year since. Posted a pic DIY back yard dragonfly pool”

We had a small garden pool at the summer cottage, emptied every winter. Pretty soon after filling it was full of mosquito larvae. Didn't see any dragonfly larvae, I assume the eggs only hatch in the spring so the emptying makes it impossible for their life cycle.

We caught some fish and put them in there. They quickly ate the mosquito larvae. In the fall the pool was emptied and the fish released back to the lake.

Thank you

Thanks

You can try to attract bats with bathouses. They also eat tons of these beasts, and even better for fruit farmers

Bat houses can take 5 years before bats will decide to live in them - they won't just settle in some strange box because they found it. This lag time makes it very difficult to determine if the bats will like your box, but just need more time - or if there is some aspect about the placement or location of the box that means they will never take up residence in it.

I guess it is an issue that they are territorial.

Damselflies deserve a bit of attention too.

Random video https://youtube.com/shorts/-ALXaGRl_g8

Their larvae are also pretty brutal predators and they also feed on mosquito larvae. Here's a YT vid showing how they hunt: https://www.youtube.com/watch?v=EHo_9wnnUTE

The ancestors of dragonflies and damselflies have been the first insects that have evolved to fly well, not just to fly.

The other insects that are good fliers, e.g. flies, wasps, bees, certain moths, have evolved towards better flying in a completely different way from dragonflies, and many tens of millions of years later.

The ancestors of dragonflies have developed special muscles that can move separately and accurately each of the 4 wings, allowing exquisite flight control.

All the other good fliers among insects use only the equivalent of two wings, either by reducing one pair of wings, like in flies, or by having a mechanical linkage between the front and back wings, which makes them act like a single pair of wings, like in wasps, bees and fast-flying moths.

Moreover, the other good fliers among insects, unlike dragonflies, do not move directly the wings, but their flying muscles are attached to the thorax and contract it for moving the wings. A system of levers transmits the movement of the thorax to the wings. This also allows the wings to beat at a higher frequency than the frequency at which the nervous system can command the muscular contractions.

Neat. So dragonflies are bitbanging the wings in a way

This looks like one of the first usages of the phrase "absolutely insane" on science.org.

Found a second usage.

https://www.science.org/content/article/how-oil-plume-change...

Nice, I suppose I didn't look hard enough.

(1999)

https://www.science.org/content/article/partners-science-par...

Still a rare event, and the first usage in a headline.

> That was a big surprise to Christofer Brothers, who studies dragonflies and damselflies at UC Davis. “Before this talk, I was under the impression they avoided contact with the water outside of females laying their eggs.”

Not to throw any shade, but this sounds... weird? I mean, missing that they do something you can only see with a high speed camera? OK. But missing that they dip into the water? Would you not at least have watched them for a couple hours if you are "studying" them? At a university?

Oh, I study data structures but I've never measured the access time of a HashMap. Am I being too harsh?

Yes. The behavior in question is not easy to observe.

> About once every 10 minutes, a dragonfly dunks its body in the water

... and you see the water splashing in the video, with the ripples being visible for a bit.

Again, I was not talking about the rotations, just the dragonflies touching/immersing in the water. I just find it incredible no one watched them for 20 minutes at a time apparently?

Given that it is utterly obvious that “no one watched them for 20 minutes at a time” is false, you should accept that this is not as simple as you imagine as a naive layman.

You may well be curious why it wasn’t noticed sooner, but no specialist will inform you when your approach to them is “So, are you just an idiot compared to me, a random nobody who has thought about your field for all of two minutes?” ;)

For a moment, I thought this was about the Dragonfly database—the Redis alternative—and my morning brain couldn't parse the title at all.

I was thinking the planetary probe to Titan.

I was thinking DragonflyBSD and -funroll-all-loops. Seriously need to get out more.

“one in 4 eventually drown”… does this mean it’s a recent evolutionary trick and selection hasn’t settled yet.

It might just be because they have to die somehow. Probably 1 in 4 humans' hearts eventually stop working too.

Selection is a balance. It is hard to judge what is being selected for when you only look at one factor (drowning).

Aging versus cancer is an example of balance: one theory is that age related diseases are a side effect of selection forces against cancer: programmed cell death after X reproductions (telomeres) are a general anti-cancer defence but the cell-death has aging effects. Also beware that selection is for successful reproduction: death after reproduction is not so relevant to evolution.

> The dunk-and-spin maneuver is risky, Yarger notes, as roughly one in every four dragonflies eventually drowns.

It's not that risky, with about a 99.99% success rate. But in their lifespan of a few weeks, they will still be doing thousands of them...

To see the presentation abstracts, at least, go here:

https://www.xcdsystem.com/sicb/program/fZq6Sh8/index.cfm?pgi...

... click on Search/Filter Program, then search for 'dragonfly'. Note that the results for each day are on separate tabs. The OP research is in at least two presentations.

I don't see a way to link directly to the search results or the presentation pages, which appear in some sort of popup.

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