I want my aliens to have some very interesting adaptations, but with these adaptations comes the question "why do they even need intelligence in the first place?". My solution to this is predators. It will make the planet more interesting and add conflict.
So my question is: What kind of predators would be perfect to cause this creature to evolve human-level sentience and intelligence?
- their diet consists of decaying organic matter and waste, which is found all over the floor of most of the planet
- they can cause very cold gas to erupt from openings on their bodies, which flash freeze at short range and fog up the atmosphere at long range
- they are slimy
- very good vision with large eyes that would rival pigeons and Mantis Shrimp on earth. Most of their other senses are weak and they have no sense of smell
- around the same size as humans, but weaker with less endurance