Need help with Headcrabs

[King Ace]

So i have the DTS and stuff how can i put them in zombie catorgory
or make them zombies plz make a cs file
http://www.mediafire.com/?sharekey=703e8d8f832b1f027f7ec40ada4772a6e04e75f6e8ebb871

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[AGlass0fMilk]

What are headcrabs? Are they from Morrowind?

[MagicAhrim]

Headcrabs are from Halflife 2 everone who studys Hemibiology should know that.