Mayethians and Temperature
Mayethia is a very hot planet. The hottest part of the day is, in fact, too hot for most of the living things to be out and active. Even the plants fold up their leaves and petals to avoid the heat.
So it might seem odd for so many creature, Maythian people included, to have fur. But the fur of Mayethia's inhabitants isn't designed to keep them warm, it's designed to protect them from their environment. Fur keep the sunlight off of delicate skin, such as a Mayethian's tail and ears. And the fur on their feet and ankles protects them from the hot ground and rough sand, dirt and grasses their walk, run and hunt through.
Another way Mayethians have evolved to live on their planet is a lower average body temperature. Their bodies have evolved to have an average temperature several degrees lower then a human, and when they eat less of the food energy is converted into heat.
The most noticeable way Mayethians have evolved to deal with the heat though, is their sleeping schedule. Most creature on Mayethia have evolved to be nocturnal, avoiding the heat of the day altogether.
It's rare for a Mayethian to ever be uncomfortably hot. They won't even begin to sweat until around 102 degrees fahrenheit. If you notice a Mayethian companion sweating, when there's no reason to, you should check the color of their inner ears, they may be sick.
Since Mayethians have evolved to deal with heat, they don't do very well in the cold. They have no adaptations to handle cold weather. They don't grow winter coats, they don't even shiver. Though they will noticeably pale and turn blue the same way humans do.
They'll exibit most of the same behaviors as any other freezing creature; sluggish movements, tucking to themself or curling up in a ball, and being less inclined to activity. They'll also become tired and are more likely to sleep even more then normal.
One unique behavior to look for in a cold Mayethian is "huffing". Blowing air quickly out their mouth and nose every handful of seconds.
