Orite 
Do you mean something like this?
https://www.youtube.com/watch?v=Ze85xP_6648&feature=PlayList&p=A916986D5119AB1F&index=73
Om yeah, but Gargs never cross paths with Barnacles in the game so 
damn, you beat me with your logic and solid knowlege of the half life universe.
no, if you won’t kill garg with generator, you’ll take it with you to ‘on a rail’, where garg can meet the barnacle above the rail-elevator [COLOR=‘DimGray’](oh, now i’m a hlfag)
HUmans were introduced to Xen only after the BM incident.
What then did headcrabs eat before?
I see 2 options here.
- Headcrabs were put there externally by the combine and were not native. But, even then, why? How do they stay alive? What do they eat?
- Headcrabs attach themselves to something other than humans in Xen. Bullsquids? no. Houndeyes? nah. The hornet dudes? Maybe. Vortigaunts? Booyah!
I realize it wont happen though.
Is that true? I’m not a Half-Life historian or anything, but didn’t they get the samples for the experiment (in the beginning of the game, that Gordon is a part of) from Xen?
Yep.
Yes.
You’re cool. I still don;t see the need to uselessly post it here WITHOUT A DAMN WRITTEN DESCRIPTION OR REASON.
Why so crazy Winged One?
I posted the pics because they show similar creatures to those found on Xen. And one plant/tree is exactly (or VERY) like the one from Xen. Namely the butcher tree.
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Because you’re acting like a child. You posted a link to a site and pictures that NO ONE appreciated in your other thread, hoping to gain some newfound respect by linking your interest in HL to everyone else. But I can vouch for the fact that everything we have to do is not connected to HL.
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You just posted a link. Even if the creatures in that dreadful show HAD looked like Xen creatures (see 3), you didn’t bother to say why this similarity was important to the topic at hand. In neither post did you say anything. Just a link and pictures.
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Unfortunately, none of the creatures look remotely like Xen creatures, and instead are the product of unoriginal minds with little creativity. The only (far-fetched) exception is that plant shit. And yet it’s still pretty different. The only thing going for it is “hurr it has pointy things that stab stab wheres my glue hurr”.
Ever watch some zombies movies? Mainly Resident Evil. The basis of it was that the military were attempting to create bio-warfare weapontry. And they succeeded except they unleashed it upon theirselves. If it were to be used on the enemy, they would simply take care of themselves. Same principle with using headcrabs to take out the opposing side (Rebels/citizens).
The Combine had nothing to do with the headcrabs on Xen. They weaponize them on Earth, but that’s different. They are opportunistic, so when they saw the headcrabs had infested Earth during the Portal Storms, they took advantage of the situation. The headcrabs, I believe, were brought to Xen by the Nihilanth and Controllers for food, or perhaps to be used as a type of guard dog, in case the Vorts ever tried to escape and break free of their psychic prison.
Which brings me to the next point: the headcrabs probably fed on the Vorts, as they were the only humanoid creature in Xen the could have fed on. I doubt very much the headcrabs attacked Gargs, Grunts, or especially the Controllers (they fucking FLY).
Anyway, since the topic has drifted away from BM, should this be moved to the HL section?
Well I knew the Combine didn’t bring them there. I was just answering his “even then, why?” question. I think that Headcrabs lived off of the healing springs. Latching onto things was a part-time job.
I always wondered about the headcrab/vort thing - theres one major thing against the little buggers trying to couple with vortigaunts, and thats the likely scenario that each vort is a little like an electric eel, insomuch as it has a natural electric current circulating about its body, thus if a headcrab did try any funny business, BAM! Fried head-humper. 
There is an alternative to what headcrabs fed on while on Xen - have a wander about there and see if you can spot anything other than the Gonarch that looks vaguely headcrab-like.
Considering HL is a science fiction story, I’d imagine theres a nice science fictiony explanation there somewhere (they do seem to be a fairly basic sort of organism, so they’d be latching onto pretty much anything organic that didn’t try and fight back - I would think that they probably gurgled “surprise” so as to distract humans when they wound up in Black Mesa, thus neatly getting around any resistance. )
@Winged One: I don’t like your behavior. Calm down would you. No personal attacks necessary. I didn’t attack you. I just calmly told you why I posted the things I posted. You will not gain anything by attacking users here. And I’m not going to respond any further to any of it. You better attack people who deserve it. I certainly don’t in this case.
This thread is about Xen creatures and their behavior. And I think that show did have a lot of similarities. I know perfectly well that it has nothing to do with either Black Mesa or Half-Life. If you can’t bring up stuff like that in this thread then why does this thread even exist? It’s about discussion around a subject and a bit of brain storming.
Well, I think I nailed the basics of behavior for NPCs in the game in one of my 1st posts.
I think headcrabs normally eat those little xen-spores that grow in certain places. The sizeable spores we saw were simply the ones that grew too big too quickly to be consumed by a headcrab. According to Kleiner, headcrabs can extract what they need from plant matter like watermelons.
As for taking control? Perhaps there used to be a more vulnerable species, perhaps one that enabled headcrabs to develop fully into gonarchs, but it got wiped out. (So after killing one of the last gonarchs, we hear “Done, what have you done…”)
The headcrabs had probably become too numerous, causing that host extinction, because there weren’t enough bullsquids (who graciously evolved headless) to keep the headcrab population in check. The bullsquids had been hunted down by intelligent species because they were also a threat, like bears were reduced because they can threaten people.
A[/size]S FOR THE original post, I would like to see headcrabs either try to defend themselves from the superior predator bullsquids, or try to flee ineffectively from them. Preferably a mix of both, according to the individual headcrab’s personality. (In Half-Life 1, they pretty much sat still to be killed.)