Desert
Traits
Burrowing A few desert creatures can burrow through sand, dust, and parched soil, gaining a typical burrow speed. |
Thirst Inured You can allow desert creatures to go without water for as long as most creatures can go without food without it counting against their number of special abilities. |
Skills Survival (master) |
The arid conditions of a desert breed tough creatures. Many desert creatures also have the arctic or thermic environmental graft, representing particularly cold or hot deserts.
Source
Alien Archive 2 pg. 139