Telson: The end segment of the body of an arthropod.
Temperate: Mild; used in reference to climate.
Tentacles: Long, thin, armlike body parts used for touching and grasping.
Territorial: Protective of a living or breeding area.
Thigmotactic: Describing animals that must maintain contact with a solid surface, usually by hiding in cracks and crevices.
Thorax: Midsection of an arthropod's body.
Tidal pool: A pool of water that remains after an ocean tide has risen and fallen.
Toxin: A poison produced by a plant or animal.
Trachea: Tubes that transport air throughout the body of most arthropods.
Transparent: See-through, clear.
Tropical: Referring to a climate with an average annual temperature more than 68°F (20°C).
Vaccine: Inactive, or dead, germs of a disease that are administered to human beings to help protect against the disease. Venom: Poison.
Viviparity: Act of producing live offspring inside the body. Vulnerable: Facing a high risk of extinction in the wild.
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