[Tyhm]

Humans should be the complete average unit of measure everything else is based off of.
Bomys are stronger against physical damage than Humans, but have weaker attacks. They're faster than a human in water and slower than a human on land.
Zulites are stronger against darts than humans, but weak against explosions. They're faster than a human on land and slower in water.

For example. It isn't necessarily accurate, but you get the idea. Humans are every bit as strong and weak as a Human. Everything else is stronger in some categories and weaker in others.