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Scallop Shell and Pearl on a Coral Table

An open scallop shell reveals a round pearl atop a flat coral structure alongside a small hermit crab.

An open scallop shell with a pearl and a small hermit crab coloring page.
Scallop Shell and Pearl on a Coral Table
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A4 format (landscape), black outlines on a white background · for home and classroom use

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A Scallop Shell and Pearl on Coral

Deep under the sea surface, marine structures form resting spots for shelled creatures. Resting upon a flat coral formation, a wide open scallop shell displays a smooth pearl while a hermit crab moves nearby across the coral base.

Natural Wonders of Pearls and Hermit Crabs

Pearls form naturally inside mollusks when a microscopic irritant becomes trapped within the shell inner lining. To protect itself, the mollusk covers the object with layer upon layer of smooth, shiny nacre until a spherical pearl forms over several years. Nearby, hermit crabs rely on discarded sea snail shells to protect their soft abdomens, trading up to larger shells as their bodies grow.

Colors of Scallop Shells, Pearls, and Coral

  • Scallop shell valves: Light cream, fan-patterned pink, or reddish-brown
  • Natural pearl: Iridescent white, soft ivory, or silver-gray with a shiny sheen
  • Hermit crab shell and legs: Bright orange-red legs with a mottled tan shell
  • Flat coral table: Pale pink, lavender, or light golden-brown
Questions and answers

Questions and Answers About Shell Treasures

Are pearls found in all types of sea shells?
While almost any bivalve mollusk can form a pearl when irritated, gem-quality pearls primarily come from specific species of saltwater pearl oysters and freshwater mussels. Scallops can produce pearls, but natural scallop pearls are exceptionally rare.
Why do hermit crabs constantly look for new shells?
Unlike crabs that grow their own hard exoskeletons, hermit crabs have soft bodies that grow bigger over time. Because their current shell does not expand, they must find larger empty snail shells to move into throughout their lives.
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