On the Trails: The sense of touch

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Touch is a mechanical sense, detecting physical stimuli such as pressure, texture, stretch, vibrations and flow. Touch receptors come in a variety of forms — special cells, often housed in bumps or pits, or triggered by special hairs or feathers.

Human animals have touch receptors all over our bodies, but these receptors are especially concentrated in our hands, with which we continually experience and manipulate our immediate surroundings. Other animals often have touch receptors concentrated in particular parts of the body too, related (of course) to how those parts are used.

The emerald jewel wasp, native to Asia and Africa, has a long stinger that not only injects venom

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