Leafcutter ants and caterpillars eat tree leaves. They feed of them and unless a tree has a SEVERE infestation the tree is none the worse for the encounter.
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The one eating is called consumer. The organism killing and eating another is called a predator. The other animal is prey.
Fleas and ticks, and other paracites can usually feed of animals without killing them. I know this answer isn't good, but ain't it better than the last?
migration
Symbiotic Bacteria
because they depend on plants or another animal for their food
Do you mean 'Name an animal that lives in another plant without killing it?' If so, one is a bromeliad frog.
A Parasite is an animal that lives in another plant or animal and eats that plant or animal without killing it. Actually a Parasite can kill its host as the definition of parasite is to live off of another, A Symbiont lives with the host to boths mutual benefit, or without harm to another.
The one eating is called consumer. The organism killing and eating another is called a predator. The other animal is prey.
... is called a parasite (but some feed off their hosts' food and not off the hosts directly e.g., intestinal parasites).
Carnivore
carnivore
It is not called euthanasia if the decision to end a life is made without the consent of the individual, or if it is done for purposes other than relieving suffering, such as for financial gain or convenience. euthanasia is a voluntary act done with the agreement of the person who is suffering.
Lewis Kenna
An animal with legs might be called a biped or a quadruped. An animal without legs can move in a two-anchor movement or in a lateral undulation movement.
It is often called an animal's pelt.
A parasite.
An animal that hunts other animals are called carnivores. The hunter is called a predator, and the hunted animals are called prey.