All animals get their energy from eating other living things. There are carnivores that eat other animals, herbivores that eat plants, omnivores that eat plants and animals, and parasites which eat from their host without killing it.

For most all animals, their energy ultimately comes from the sun because plants get their energy from the sun. Since some animals eat plants and some animals eat animals that have eaten plants, they indirectly get their energy from the sun. The exception to this rule is animals deep in the ocean near hydrothermal vents which get their energy from eating bacteria. These hydrothermal bacteria get their energy from chemicals in the vent rather than sunlight.

So animals get their energy from eating other living things and most of them get their energy indirectly from the sun.