On the edge of the Koprulu Sector was a planet, an ordinary planet, one that had life, but not sentient life, didn't have any rare or important resources, and didn't stand out at all. Nobody would care about it, and that's why Abathur chose it. 

It had been a few weeks since he and his own swarm landed on the planet, they had dealt with the world's surprisingly hostile fauna and were reduced in numbers, only Abathur, 7 drones and 3 zerglings remained.

[i]Local fauna. Impressive combat capabilities, large adaptive potential. Introduction into swarm could prove benefivial. Could not acquire sample, dissapointed.[/i]

He sought to hide on a nearby mountain, perhaps in one of the cave systems and start a hive there to reinforce the Zerg presence and gather samples from the fauna. As they reached the temple, Abathur noticed something odd in a nearby cave. It seemed to be a portal of some kind, similar to the ones of the protoss, although he sensed that this particular one seemed... different. His curiosity took the better of him as he moved into the portal as his minions followed him. The portal then dissapeared, leaving no trace of the Zerg behind.