Animals lose energy simply by existing. The more strenuous the activity they are performing, the more energy they will lose.
By running and being very energenic.
Animals lose energy through metabolic processes, such as digestion and respiration. Energy is also lost through physical activity, such as movement and hunting for food. Energy can be lost as heat through thermoregulation to maintain body temperature.
Tapeworms basically get their energy from their host, gaining the nutrients people/animals get from food. They tend to make people lose weight due to the fact that they are leeching off all the nutrients you can get from food, which is why people/animals with tapeworms become thin, and lose weight.
some animals (bears) do this to conserve energy usage during the winter
Warm-blooded animals cannot be too small; otherwise, they will lose heat faster than they can produce it. This energy produced by warm-blooded animals mostly comes from food. Food represents stored chemical energy (potential energy), which is converted into other forms of energy within the body when the food is metabolized.
Animals lose water when they urinate, perspire, and exhale.
You'll lose all the animals that live in it and near it (I assume)
animals and electrical energy
Animals will lose nitrogen when they die. This is whey decay and nitrogen is released as ammonia into the air.
the animals that hibernate are unable to handle the conditions like bears they are unable to handle the drop in food supply
Plants get their energy through photosynthesis, and animals get their energy by consuming plants or other animals.
animals get there energy by eating other animals