three-spined stickleback

== English == === Alternative forms === three-spine stickleback === Noun === three-spined stickleback (plural three-spined sticklebacks) Gasterosteus aculeatus, a small fish of coastal and inland waters of the Northern Hemisphere, that can make its spines erect when threatened, which makes it hard to swallow. ==== Translations ==== === References === three-spined stickleback on Wikipedia.Wikipedia Gasterosteus aculeatus on Wikispecies.Wikispecies Category:Gasterosteus aculeatus on Wikimedia Commons.Wikimedia Commons