(Wandering the Ailen wasteland that is now Black Mesa, this section of the facility wasn't destroyed and still quite infested, as you're wandering about, avoiding headcrabs and Headcrab Zombies, the occasional Vortigaunt, you come across an interesting little creature in the break room, a large ant looking creature that's causing some sparks as its munching on the "leftovers" of one of the other monsters... so a body.

It hisses at you, and looks at you, but, it speaks)

Back off human! (Spark, ZAP) This one's mine...

(It hisses again before munching again, eyeing you incase you do somthing)