Scientific name: Gasterosteus aculeatus
Size: Up to 10cm long
Distribution: Found throughout the UK
Months seen: All year round
Life Span: Approximately 3 years
Habitat: Ponds, lakes, slow moving streams and rivers with fresh or brackish water
Food: Aquatic insects and crustaceans
Special features: Sticklebacks (sometimes called Tiddlers) are our smallest freshwater fish, usually being less than 5cm long. The name comes from the arrangement of spines along the top of the fish in front of the dorsal fin.
During the breeding season the male has a bright orange belly. He builds a tunnel shaped nest on the bottom of his habitat and lures the female inside so she can lay her eggs there, after which he fertilises them.