Final answer:
Helen Keller had a bird as a pet, and she also had a kitten that was killed. She was fascinated by birds and would bury them in a box.
Step-by-step explanation:
Helen Keller had a variety of animals as pets. In the text, it mentions that she had a bird, which was probably kept in a cage. Additionally, there is mention of a kitten that was killed with a hatchet. It is also implied that Helen Keller had a fascination with birds and liked to bury them in a pretty box.