I recently saw a scatter plot somewhere, I believe it was speed vs energy efficiency or something body weight vs cost of transport. And all animals, as well as most modes of transport follow a roughly anti-proportional relationship on a log-scale. If you're fast heavy, you use a lot of energy. If I remember it right, the fastest most efficient animal was the salmon (?). There was one single outlier from that trend, an animal that is much too fast and much too efficient for its weight at the same time: Human on a bike.

Edit: Found it: https://slowrevealgraphs.com/2025/12/31/a-human-on-a-bicycle-is-among-the-most-efficient-forms-of-travel/