Ectoparasite: Parasitic organism that lives on the outside of its host organism.

Eggs: The reproductive cells that are made by female animals and that are fertilized by sperm, or reproductive cells of male animals.

Elytra: The hard, leathery forewings of beetles.

Endangered: Facing a very high risk of extinction in the wild.

Endoparasite: Parasitic organism that lives on the inside of its host organism.

Engorge: To fill up with blood.

Entomologist: A scientist who studies insects.

Estuary: The wide part at the lower end of a river, where the river meets the sea.

Evolution: Gradual process of change over time.

Exoskeleton: An animal's outer covering or supportive structure; the external skeleton or hard outer covering of some animal, especially arthropods.

Extinct: No longer alive.

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