File:Very small crab, caught on a fishing rod.jpg - Wikimedia Commons

By A Mystery Man Writer

File:Crucian Carp.jpg - Wikipedia

Alaska: Billions of snow crabs have disappeared from the waters of the Bering Sea

File:Ghost Crab (7609537532).jpg - Wikimedia Commons

File:Herring Gull & Crab (7489526950).jpg - Wikimedia Commons

Diversity, Free Full-Text

Frontiers Assessing the sustainability of the blue swimming crab (Portunus pelagicus) on the Eastern Coast of Lampung: a holistic approach to conservation and resource stewardship

Hermit crab - Wikipedia

File:Little crab (6348555302).jpg - Wikimedia Commons

Crab Vector Stock Illustrations – 49,273 Crab Vector Stock Illustrations, Vectors & Clipart - Dreamstime

Are Chinese mitten crabs (Eriocheir sinensis) suitable as biomonitor or bioindicator of per- and polyfluoroalkyl substances (PFAS) pollution? - ScienceDirect