The three-spined stickleback is a small, spiny fish found in shallow freshwater and brackish habitats across the Northern Hemisphere. Males develop vibrant red undersides during breeding season and fiercely defend nests built from plant material. Despite their tiny size, sticklebacks are bold hunters of small invertebrates and larvae, and have become important subjects in evolutionary biology studies.
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Three-Spined Stickleback
Gasterosteus aculeatus
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