When a mouse eats a plant how much of the plants energy is transferred to the mouse?

When a mouse eats a plant, typically only about 10% of the plant's energy is transferred to the mouse. This is due to the inefficiency of energy transfer between trophic levels, as a significant portion of energy is lost through metabolic processes, heat, and waste. As a result, the mouse utilizes a fraction of the energy stored in the plant for its own growth and activities.