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Zoology: Shark skin (acanthias acanthias). Scales from the skin of a shark. These sharply pointed placoid scales are also known as dermal teeth or denticles. They give the shark’s skin the feel of sandpaper. The tip of each scale is made of dentine overlayed with dental enamel. The lower part of each scale, which anchors it into the skin, is made of bone. The scales disrupt turbulence over the skin, considerably reducing the drag on the shark as it swims. This design has been investigated by engineers for use on the surfaces of aircraft and boats.
shark skin

Vespidae, vesp (vespa crabro). The European hornet is the largest of the European wasps. The head has two antennae, branching to left and right from between the two compound eyes. The biting jaws (mandibles) are below the eyes. The six legs and the wings are attached to the thorax, the part of the body behind the head. There are two pairs of wings, but they are joined together and look like a single pair of wings.

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