In addition to the Swarm aliens featured in Jacob's Rest, there are several unused models which except for the Shaman, seem to be beta versions of the current models created for a Source build dating back to the period around 2006-2007. They share the same names as the Swarm Aliens released with the game. All are fully animated and are visible below.

Buzzer Drone Harvester Mortarbug Parasite Queen Shieldbug
Buzzer0 Drone0 Harvester0 Mortarbug0 Unusedparasite Queen Shieldbug0

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