three-spine stickleback

== English == === Alternative forms === three-spined stickleback === Noun === three-spine stickleback (plural three-spine 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. === References === three-spined stickleback on Wikipedia.Wikipedia Gasterosteus aculeatus on Wikispecies.Wikispecies Category:Gasterosteus aculeatus on Wikimedia Commons.Wikimedia Commons