I believe you are thinking of symbiosis (or a "symbiotic relationship), since animals are not known as good samaritans.
Hunger
The one eating is called consumer. The organism killing and eating another is called a predator. The other animal is prey.
A beasty is another term for a beastie, a slang term for a beast or animal.
parasitic hurts the animal the term is mutual
A zoolith is another term for a zoolite, a fossilized animal.
Ethical treatment of the animals.
Parthenogenesis
Central, centre dont know if this helps! witchyblinks;)
When an animal eats a dead animal, it helps recycle nutrients back into the ecosystem. This process helps maintain the balance of nutrients in the environment and provides food for scavengers and decomposers. Additionally, it helps prevent the spread of diseases by removing carcasses.
Glycogen is the proper name for animal starch. It is stored int the livers and muscles of animals. It can also be found in certain kinds of fungi and bacteria.
A zoonose is another term for a zoonosis - an animal disease, such as rabies or anthrax, which can be transmitted to humans.
Another word for organism would be: Animal Life or Environmental Life! Hope this helps! :)