Ten seahorse species in exact licensed photographs. The video compares head shape, tails, spines and colour; it is an editorial selection, not a field guide. Photograph credits: 1. Hippocampus kuda (Yellow estuary seahorse).jpg; Nhobgood Nick Hobgood; CC BY-SA 3.0; ; https://commons.wikimedia.org/wiki/File:Hippocampus_kuda_(Yellow_estuary_seahorse).jpg; 2. Fish4280 - Flickr - NOAA Photo Library.jpg; SEFSC Pascagoula Laboratory; Collection of Brandi Noble, NOAA/NMFS/SEFSC; Public domain; ; https://commons.wikimedia.org/wiki/File:Fish4280_-_Flickr_-_NOAA_Photo_Library.jpg; 3. Hippocampus abdominalis (white).jpg; Wikimedia Commons contributor not specified in metadata; CC BY-SA 2.5; ; https://commons.wikimedia.org/wiki/File:Hippocampus_abdominalis_(white).jpg; 4. Caballito de mar pigmeo (Hippocampus bargibanti), Anilao, Filipinas, 2023-08-25, DD 26.jpg; Diego Delso; CC BY-SA 4.0; ; https://commons.wikimedia.org/wiki/File:Caballito_de_mar_pigmeo_(Hippocampus_bargibanti),_Anilao,_Filipinas,_2023-08-25,_DD_26.jpg; 5. Hippocampus histrix (Thorny seahorse).jpg; Nhobgood Nick Hobgood; CC BY-SA 3.0; ; https://commons.wikimedia.org/wiki/File:Hippocampus_histrix_(Thorny_seahorse).jpg; 6. LongSnoutedSeahorse1600ppx.jpg; FASTILY (TALK); CC BY-SA 3.0; ; https://commons.wikimedia.org/wiki/File:LongSnoutedSeahorse1600ppx.jpg; 7. Hippocampus hippocampus (on Ascophyllum nodosum).jpg; Hans Hillewaert; CC BY-SA 4.0; ; https://commons.wikimedia.org/wiki/File:Hippocampus_hippocampus_(on_Ascophyllum_nodosum).jpg; 8. Hippocampuszosterae.jpg; Stickpen; Public domain; ; https://commons.wikimedia.org/wiki/File:Hippocampuszosterae.jpg; 9. Longsnout Seahorse (Hippocampus reidi).jpg; Cliff; CC BY 2.0; ; https://commons.wikimedia.org/wiki/File:Longsnout_Seahorse_(Hippocampus_reidi).jpg; 10. Hippocampus barbouri 01.JPG; H. Zell; CC BY-SA 3.0; ; https://commons.wikimedia.org/wiki/File:Hippocampus_barbouri_01.JPG;