Climbing

In episode two, it is shown that Cobalt is a particularly bad at climbing.

Climbing in Episode Two
Cobalt is chasing a bird when it lands on the branch of a tree. Hungry, Cobalt attempts to climb the tree after it.

"Well, you did just try to climb after it. And even you know climbing is not your best skill!"

- Aidan to Cobalt after he tried to climb after the bird.

It is shown that Cobalt is not good at climbing things, especially trees.