Ambulapisapiens

 colloquially called Trull is a species of sentient rock people from the planet Deh'treetoos.

Culture
Trulls are a rough but not malicious species. They like to handle things upfront and be direct about issues, which can make them appear brash and uncouth at first. This doesn't mean that they can't be subtle and gentle when approaching topics.

They don't hold a grudge for things other's ancestors did and expect the same treatment of others. "The past is a savage place inhabited by poor souls who didn't know better -Terrace Brickroad (Trull physicist and philosopher)"

Despite, or rather because, of their excellent physique they value intelligence and cunning within themselves. Muscle power is common and easily accessible, but a bright mind is rarer.

Physiology
The body of a Trull is composed of rock-like substances that give them a tough hide and make them hardy folk. A special property of them is, the material that their body is made of, is actually influenced by their surroundings to a degree.

Most Trull are made of variations of certain stone types, but some may be made of material like granite, basalt, brick, slate, limestone, sandstone and in rare cases even metals or crystals. Because of this there is the myth that Petrosapien share a common ancestor, which has been conclusively disproved.

Their brains are made of silicate semiconductors. As a result of this, their mental capacity is directly linked to temperature. But those effects are only really visible after prolonged exposure to a temperature. Deh'treetoos has an average temperature of 20°C/68°F, which is considered their baseline temperature to measure intelligence. In heat (30°C/86°F) they need to work overtime, slowing reaction and mental faculties considerably. In cold environments (10°C/50°F) the excess heat from thinking easily and quickly dissipates into the environment increasing all mental operations. Extreme temperatures are an extra 10°C/18°F away from the base temperature. Extreme cold (0°C/32°F) will slowly drain their energy but raise their intellect beyond all but the most extreme Galvan levels. While extreme heat (40°C/104°F) will completely immobilise them, damaging their brain if it's used. These effects vary, since the material their body is made of can influence the material their brain is made of.

Design
Non mutated transformations based on have to adhere to the following rules:
 * broad build.
 * body made from common Scandinavian stones
 * Has to look like naturally formed rock that somehow moves, not a statue of other species.
 * teeth made of, preferably white or clear, gem stones (Diamonds are most common)
 * There is no visually obvious difference between male and female.

Unmorphable traits

 * Body and Teeth made out of a kind of mineral.
 * includes but not limited to
 * stone
 * crystal
 * metal