What type of muscle is described as being under the control of the animal?

The type of muscle that is described as being under the control of the animal is voluntary muscle. This type of muscle is consciously controlled by the animal's nervous system, allowing for intentional movements. For instance, actions like walking, running, and other movements of the limbs involve voluntary muscle because the animal can decide to contract or relax these muscles at will.

Voluntary muscles are often associated with skeletal muscle, which is typically striated and attached to bones, facilitating movement of the skeleton. While skeletal muscle does indeed fall under the category of voluntary muscle, the specific term "voluntary" directly indicates the conscious control aspect, making it the most accurate answer.

In contrast, involuntary muscle operates without conscious control and is responsible for functions such as the movement of food through the digestive system or heartbeats. Cardiac muscle, which makes up the heart, is also involuntary and functions automatically. Thus, while skeletal muscle is a type of voluntary muscle, the term "voluntary muscle" more precisely addresses the control factor described in the question.