Question

1. the chimpanzee had such (orthodox or maternal) feelings toward the hippo that she even tried to nurse the giant beast.

Explanation:

The context shows the chimpanzee's caring - like a mother - behavior of trying to nurse the hippo. "Maternal" means related to a mother or motherhood, which fits the context. "Orthodox" means following traditional or established beliefs, which is not relevant here.

Answer:

maternal