[ExI] Ant Games
avant at sollegro.com
Wed Apr 8 22:40:26 UTC 2020
>> ...While your idea of using a string to get ants to get rid of wasps is
> very clever, the guy who took the video who is an amateur ant enthusiast
> claims that this is completely an ant construction with no help from him...
> Stuart LaForge
> Hmmmm. I have seen ant bridges in my tragically misspent youth, but they
> were vertical hangers.
> If one works thru the mechanics of the thing, to do this without a structure
> would require the ants went from the attachment points in tight formation
> along the eve, clasped paws (or claws or anything they got now) and
> subsequently released their grip on the underside of the eve. I can't
> imagine ants doing this, or why they would do it.
The why of the matter is a little easier than the how. An unladen
worker ant has claws that enable it to crawl across the ceiling
inverted. Notice the ones scurrying around the base of the wasp nest
in the video thus the scouts being able to discover the wasp nest and
set down a pheromone trail. The problem is that the fat white wasp
larvae probably weigh several times what a worker ant does, and tarsal
claws are not good enough for that, unlike a fly or a gecko's adhesion
The how is harder to ascertain. It is because this genus of ant,
Eciton, is known for building bridges. Normally they build cantilever
bridges to cross gaps right side up. But in this case, since they are
inverted, they built a suspension bridge. It is of note that this
species builds nests out of their own bodies called bivouacs that hang
from support structures.
These hanging bivouacs have millions of individuals inside as well as,
if I recall correctly, the largest queen of any ant species. They can
get away with that long massive suspension bridge because their bodies
are much stronger under tension than they are under compression or
The Eciton ant colony forms a very smart swarm mind composed of ants
whose tiny brain are a larger percent of their mass than our brains
are ours. Each such ant is in dynamic pheromone and touch contact with
millions of other individuals within the colony. In the case of army
ants of the genus Eciton, this hive mind is obsessed with efficiency
as can be demonstrated by this article from PNAS about the
pattern/algorithm that army ants use to cross gaps.
In short, if an ant encounters a gap, then it slows down and tries to
reach across the gap. If the ant slowing down causes another ant to
crawl atop it, then the ant that gets walked on essentially grabs on
tight and freezes in place, becoming a girder in the bridge.
> There must be something more going on, for photography has been with us for
> a long time, yet I find no other examples of anything distantly analogous to
> this bridge.
If you look at the bivouac structures in the alamy link, then you will
see several structures that are somewhat analogous. Also look closely
at the video. Here is a better quality copy without any annoying music:
Notice that there are "bridging" workers. Workers who are stationary
and acting like support cables. If a man-made string was there, there
would be no need for the ants to bridge, those bridging workers would
simply use the string to gather the wasp larvae faster, better, and
> Could it have been assisted by some other agent who then called upon him
> after the ant bridge was in place?
I did notice that the videographer had his Twitter account deleted so
maybe you are right. It just seems odd that a hoaxster would use such
a long string when a much shorter one would have sufficed. Whereas
small living cables of high tensile strength and low shear modulus,
would likely try that elongated catenary curve so as to minimize
gravitational shear forces and exploit their tensile strength. My
guess is that started somewhere near the middle and worked its way
Because the guy deleted his Twitter account, I admit it might be a
hoax. He is an electrical engineer after all. But there is sufficient
physical evidence to give it the benefit of the doubt, don't you think?
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