Let's talk about Bergmann's rule.
It states: within closely related organisms, as latitude increases (closer to the poles), average height and volume of an organism increases.
For example, the size of penguins increases as a continuous function of latitude.
(🧑🎨: Karel Frydrýšek)
I always thought it was that things in cold environments selected for larger bodies because the way internal heating works in life her on this planet it's more efficient when the body is bigger to a degree. There's a cut off point where it's diminishing returns.
