1537 pets
Underroach 
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Want it | 
Poor
No
Neutral
Ground
Crawls about, waving antennae.
Unknown
None
3 allowed
The War Within
Patch 11.1.0 | Posted: February 25, 2025
Vs. 
Humanoid
Vs. 
Aquatic
Critter
Flying
Dragonkin
50% from Beast abilities
33% from Elemental abilities
1-2 of 2
1-2 of 2
Scientists, engineers, and gamers of Undermine must keep their desks clean lest they be visited by the underroaches.
Actually it's much easier to tell them apart. The regular brown version has bright blue eyes, the orange version has bright green eyes.
The Underroach comes in two colours, which look superficially similar on the page here. The easiest way to tell them apart is that the regular brown has a pale stripe across its thorax (between head and abdomen), while the other variant has no such marking and is more of an orange-brown colour. According to the database, the orange-brown is the rarer spawn (3 in 23, or 13.0%), and the brown with pale thorax stripe is common (20 in 23, or 87%).
This pet can also occur as a wild secondary pet, so if you find a secondary with good stats you can always just keep restarting the battle until it appears in the colour you're after.