threespine stickleback
English
![](Images/wiktionary/GasterosteusAculeatusMaleHead.JPG.webp)
The threespine stickleback.
Wikispecies
Alternative forms
- three-spined stickleback
Noun
threespine stickleback (plural threespine sticklebacks)
- Gasterosteus aculeatus, an endangered species of European stickleback.