From 2speccers2tools wiki

Due to the high variety of life that now inhabits the Hot Planet, there is also a lot of dead stuff lying around with not much stuff being able to eat some of it, resulting in the specialization of some Semasand and evolution of the Sandslime. They are far smaller than their ancestor, making this up with their very fast reproductive rates, and acids they produce used to break down food. They are rather spite-resistant due to their diet, and often radiate it to prevent being eaten. Despite being specialized in eating dead matter, they can still derive energy from heat if needed, making it somewhat easier for them to live much of the time. Their bodies are very malleable, being able to contort into a variety of forms to move and wrap around food.