Ten examples of crab shells, claws and silhouettes. This is not a ranking or field identification key; photographs show particular individuals, not every sex or age form. Names follow source identifications; photographs do not share one scale. Scenes 1, 2, 3 and 7 use studio or collection photographs rather than observations in natural habitat. All ten scenes and posters use real photographs, not AI-generated imagery. Changes: format conversion, resizing, composition with titles, captions and narration; posters are made from raw photographs without video text, with landscape cropping and a full-photo contain fit for the portrait. No author endorsement is implied. Photographs retain the listed licenses. The video adaptation and project contributions are offered under CC BY-SA 4.0, https://creativecommons.org/licenses/by-sa/4.0/ ; CC BY-SA 3.0 photo adaptations use the permitted later version with the same license elements. Script and captions: project; synthesized voice: Microsoft Edge TTS; no music. Photograph credits: 1. Cancer pagurus.jpg; Hans Hillewaert; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Cancer_pagurus.jpg. 2. Carcinus maenas.jpg; Hans Hillewaert; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Carcinus_maenas.jpg. 3. The Childrens Museum of Indianapolis - Atlantic blue crab.jpg; Wendy Kaveney; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:The_Childrens_Museum_of_Indianapolis_-_Atlantic_blue_crab.jpg; The Children's Museum of Indianapolis, https://www.childrensmuseum.org/ ; photographer Wendy Kaveney. Author and required institution credit verified on Commons file page.. 4. Sally Lightfoot Crab 2019.jpg; Nosferattus; CC0; http://creativecommons.org/publicdomain/zero/1.0/deed.en; https://commons.wikimedia.org/wiki/File:Sally_Lightfoot_Crab_2019.jpg. 5. Ocypode quadrata (Cahuita).jpg; Hans Hillewaert; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Ocypode_quadrata_(Cahuita).jpg. 6. West African fiddler crab (Uca tangeri) male.jpg; Charles J. Sharp; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:West_African_fiddler_crab_(Uca_tangeri)_male.jpg; Own work , from Sharp Photography, sharpphotography; Sharp Photography, https://www.sharpphotography.co.uk/. 7. Macrocheira kaempferi.jpg; Lycaon (Hans Hillewaert); CC BY 2.5; https://creativecommons.org/licenses/by/2.5; https://commons.wikimedia.org/wiki/File:Macrocheira_kaempferi.jpg; Image:Riesenkrabbe.jpg by Michael Wolf. 8. Geosesarma dennerle.png; AverageWalrus; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Geosesarma_dennerle.png. 9. Pacific land crab (Gecarcinus quadratus).jpg; Charles J. Sharp; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Pacific_land_crab_(Gecarcinus_quadratus).jpg; Own work , from Sharp Photography, sharpphotography.co.uk; Sharp Photography, https://www.sharpphotography.co.uk/. 10. Blue Land Crab, Villa Hermosa, Villa Hermosa, La Romana, DO imported from iNaturalist photo 47434739.jpg; (c) Aitor, some rights reserved (CC BY); CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:Blue_Land_Crab,_Villa_Hermosa,_Villa_Hermosa,_La_Romana,_DO_imported_from_iNaturalist_photo_47434739.jpg; https://www.inaturalist.org/photos/47434739. Original photograph underlying scene 7: Michael Wolf, https://commons.wikimedia.org/wiki/File:Riesenkrabbe.jpg ; derivative credited to Lycaon (Hans Hillewaert), under the selected CC BY 2.5 license.