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a close, long-term relationship between two or more species


an organism that consumes another.


an organism that is eaten by another.


a relationship where both organisms benefit from each other.


a relationship where one organism benefits and the other is not helped or hurt.


a symbiotic relationship where one organism benefits and the other is harmed.


an organism that feeds off of another living creature, usually without killing it


the organism that is harmed in a parasitic relationship


when two or more organisms fight for the same limited resource (food or space.)


A bird builds its nest in a tree where it is safe from predators. The tree is unaffected by the birds.


A tapeworm lives inside the digestive tract of a dog. The dog begins to lose weight over time because the tapeworm is taking away its nutrients.


Stinging ants live in a tree with thorns for protection. In turn, the ants protect the tree from being eaten by other animals.

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