Rare Agressive behavior in A. gigas millipedes

SDCPs

Arachnolord
Joined
Feb 8, 2012
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659
Today I was lucky enough to witness some rarely-seen aggressive behavior between 2 of my A. gigas millipedes. I still can't get over the shock/awe of it.

In the 50 gallon aquarium I am keeping them in, I have a black plastic lid from a rubbermaid container which I place food on to keep it from contaminating the substrate. I recently discovered that one of my 3 giant millipedes had made her home beneath it. In fact, I held this particular millipede last night.

Now nicknamed "the bunker," this cave, dug out beneath the feeding tray, was the scene of the dispute:

120211-124903.jpg

I was working in the room with the aquarium at around 12:40 when I happened to glance over at the food tray. To my utter shock, since the millipedes had been in hiding for several days, a head appeared from the opening of "the bunker" with furiously waving antennae and rapidly moving legs. Since the bunker is close to the glass, the millipede reared up on the glass, but realizing she wasn't going anywhere, she commenced to flee to the right, at top speed. The jet black body undulated rapidly, reminding me of a tank plowing over rough terrain. Through the vehement action of her body, the entrance to "the bunker," before as obscure as the entrance to a Vietnamese tunnel, broadened considerably. Even with the heavy log above it, she vertically displaced the plastic tray, creating the illusion of an earthquake created by a mighty jungle monster. As she was 3/4 of the way out, a second black form appeared. I was struck with horror: was my millipede in two pieces?

But no, this form sported antennae also. Ironically, having succeeded in forcing the former inhabitant out, her head endured some thrashing punishment from the tail of the desperate retreating myriapod. With the former millipede a distance away, this second animal slightly emerged from the obscure darkness of the "bunker," then slowly backed in. A minute or two later, her head appeared again, only to once again plunge into the darkness of the "bunker."

As to the former millipede, the intrusion induced has induced a state of depression, and she has been slowly wandering about the opposite side of her enclosure with head held downwards.

120211-125021.jpg

I did not see what happened inside the "bunker," and I do not know how the second millipede entered (through the front or by tunneling under the chamber) or why the first fled in such a panic. But from ought I can conclude, the larger of my two females stole the burrow of the smaller, A burrow I had just seen the fleeing millipede in complete possession of the night before.
 

SDCPs

Arachnolord
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Feb 8, 2012
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659
They were at it again! I was watching one which was crawling about, and it went into the cave where the other was! It looked like they were actually fighting in there. The bigger one was violently curling around the smaller one, or trying to, they were writhing in there and knocking against the tray actually making noise. I took the logs off and broke it up. Then I made the cavern a little big bigger, also saw evidence of them munching on the leaves :)

I hope they don't hurt each other! Seem pretty territorial right now, I wonder what's up. I Hope egg laying will ensue!

Where the male is, I have no clue. He's always been elusive, but the last thing I expected was a clash between the females. One needs to find another burrow I guess.
 

SDCPs

Arachnolord
Joined
Feb 8, 2012
Messages
659
We had a repeat of yesterday at 9:30. Like watching a video again, almost the exact same things happened, LOL! Does anybody know why they are being so territorial right now? The smaller one crawled into the bigger "bunker," where the big female lay curled up. As soon as the other entered, she rose to defend her territory. These fights are kindof interesting to watch, but I wonder it there's something more at stake than a mere sleeping hole since that one is so aggressive!

Probably happens when I'm not watching, also :(
 

SDCPs

Arachnolord
Joined
Feb 8, 2012
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659
Friends for now? Maybe...they're both in there. I don't know how long it will last though :p

Perhaps my enlargement (of the retreat) did some good.
 

Galapoheros

ArachnoGod
Old Timer
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Jul 4, 2005
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8,982
I've seen similar behavior between males. At first I thought they might be confused males trying to mate, but it's looked too aggressive and fast to me, looking like they try to bend and push their heads into each other too hard. It could be where some of the scaring seen on millis comes from.
 

SDCPs

Arachnolord
Joined
Feb 8, 2012
Messages
659
The thing here is these are females, I expected them to be civilized, LOL! But I guess the gender doesn't matter too much. Is the scaring visible when you shine a flashlight on the exoskeleton? Because it looks quite different under intense light.

The behavior you're describing is exactly what I witnessed, except one seemed to be doing most of the fighting, the other running but persistently coming back. I guess persistence won out, because they are friends right now. Both in the "bunker" without issues.

The funny thing is they're so long and slow that the fights are watchable, unlike other critters. And banging your head into something doesn't seem the smartest way, but what else can they do?
 
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