vastlysuperiorman t1_j8n434e wrote

For example, in this picture, you see one rabbit with a huge carrot, and one rabbit with a small one. You'd think the big carrot indicates success, but since the stem is so small, the rabbit is very unlikely to succeed at pulling it from the ground.

The rabbit with the small carrot has a lot to grab onto and the stem is strong relative to the size of its root. Even though his reward is smaller, he's much more likely to succeed at pulling up his carrot.