Question

Read the paragraph from "The Think Tank":

Shumaker has known most of the zoo's orangs since they were born. "Orangs' mental abilities are the least understood of the great apes," notes the biologist. "We want to learn more about them, mentally. We also want to add to the quality of their lives by giving them some challenges, some mental enrichment. They all take part in the project voluntarily. None of them is ever forced or punished."

Based on this paragraph, which conclusion can be drawn about Shumaker?