The general term is "deformation." This process can occur through various mechanisms such as folding, faulting, and shearing, leading to changes in shape or size of rocks.
Eel
How would you describe the shape if the animal pictured above? This image is of a red fox.
When a fursona has the word 'anthro' applied to it (it's probably already anthropomorphic, as a furry, anyway), it's referring to the body shape. That means the character has a human's general body composition. Feral, as another example of a body shape, would imply a more natural animal's build.
Well, it depends what animal, because every animal is addapted to its habbitats soo....
yes.
The word you are looking for is "contortion." It refers to the act of twisting or bending out of the normal shape or position of a part of the body.
You would need to know the size of the tracks and the shape. The shape would tell you what general type it was. From that, you could look at the size of the footprint and calculate the size of the animal based on the ratio of the foot to the rest of the body for that type of animal.
balls
One example is that the dolphin has a stream-lined body.
Humans. The shape stays the same, the only scale and proportion changes.
The lower body of a centaur is shaped like a horse.