There's been a few Zoo maps that existed during Half-Life...

There's been a few Zoo maps that existed during Half-Life's development: zoo.bsp (a Zoo for all Human NPCs) g_zoo.bsp (a Zoo for all the German versions of the Human NPCs) alien_zoo.bsp (a Zoo for all of the Xen-based NPCs) sprzoo.bsp (a Zoo for all of the sprites in the game) With that knowledge, the attached image shows both a Chubtoad (Xen creature) and a Rat (non-Xen creature) next to each other. If its assumed no Xen creatures were in "zoo.bsp" then this deeply implies that the Rat is in "alien_zoo.bsp." #RatFacts

(Edited)

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