Plenty of temperature to make Silicones!
"Sand Doom"
William Fitzgerald Jenkins
Their blood consists of short-chain Silicones, with quartz reinforcing for the soft parts and their armor, teeth, etc.
"Uller Uprising"
Henry Beam Piper, John D. Clark and John F. Carr
Since the animals are Silicones, they don't get sluggish like cold snakes.
"Uller Uprising"
Henry Beam Piper, John D. Clark and John F. Carr